Text edits, Sphinx formatting

removed old rules for generating manuals

rearranges docs and build script

Two reasons:
- sphinx requires to have all sources in its source directory
  so man pages have to be moved
- layout of subfolders in doc folder was not consistent

Additional text edits, Sphinx formatting

Additional edits, Sphinx formatting

disabled discovery of old tools in ./configure

improved build scripts, renamed kea-guide.rst to index.rst

Various Sphinx edits

many improvements to docs based on sphinx

- improved code-blocks
- improved json formatting: more compact, replaced // to # for comments
  to make them highlighted
- improved tables proportions
- fixed kea version: |release| should be used instead of KEAVERSION
- changed them to 'Read The Docs' to align with BIND
- cleaned up conf.py
- improved building in Makefile.am, now there are 3 targets (pdf, html, singlehtml)
  and 'all' that depends on those 3
- added kea.css to make html content wider and tables narrow to fit into
  text column

Fix broken label

Add `.. note:` and `..warning:` directives for Sphinx conversion

Converting from docbook to sphinx: fixing links, making content/grammar corrections as needed

Converting from docbook to sphinx: fixing links, editing grammar and style as needed

Converting from docbook to sphinx: fixing links, making content/grammar edits as needed

Continuing conversion from docbook to sphinx: adding/fixing links, editing content/grammar as needed

Fixed more links within the documentation, plus small content and grammar edits. Changes are made through line 1341 of dhcp6-srv.rst.

Updating links for conversion from docbook to sphinx; editing for clarity, grammar

Fixing links, updating text for conversion from docbook to sphinx; dhcp4-srv.rst is only partially done, and the links within the other files (including those committed yesterday) need to be changed to the correct format

Added links to proper places within and outside of documentation, added section numbers, fixed grammatical/syntax/clarity errors

Update missing section references for sphinx conversion

Added targets for PDF and multi-page HTML

 - also updated -M to -b which is supported by sphinx 2.x

Initial changes to have sphinx detected

initial conversion of kea guide from docbook to rst/sphinx

[742-new-libyang-and-sysrepo-versions] Added ChangeLog entry for sysrepo 0.7.8

[742-new-libyang-and-sysrepo-versions] Updated to the 0.7.8 value API

[742-new-libyang-and-sysrepo-versions] Added HAVE_POST_0_7_7_SYSREPO config flag

[master] Merge branch 'master' of gitlab.isc.org:isc-projects/kea

    Fixed ChangeLog

[732-set-with-incorrect-tag-new-exception] Added ChangeLog entry for -set and no server

[732-set-with-incorrect-tag-new-exception] Added a new unit test (for v4 and v6) to check NullKeyError message

[732-set-with-incorrect-tag-new-exception] Code done - new unit test to check message to do

[470-server-tag-get-command] Added ChangeLog entry for server-tag-get

[#175,!414] Updated ChangeLog

[#175,!414] Fixed whitespace again.

[#175,!414] Addressed more review comments

src/lib/util/boost_time_utils.*
    renamed DEFAULT_FRAC_SECS to MAX_FSECS_PRECISION
    added commentary and fixed indentation

src/lib/util/tests/boost_time_utils_unittest.cc
    added commentary

Apply suggestion to src/lib/util/boost_time_utils.cc

[#174,!414] Corrected whitespaces and copyright dates.

As a result of the review.

[#174,!414] Cleaned up fractional seconds handling

src/hooks/dhcp/high_availability/communication_state.*
    CommunicationState::logFormatClockSkew() - generates log
    without fractional seconds

src/hooks/dhcp/high_availability/tests/communication_state_unittest.cc
    TEST_F(CommunicationStateTest, logFormatClockSkew)  -
    added check of entire log content

src/lib/http/date_time.*
    HttpDateTime::HttpDateTime() now uses second_clock to eliminate
    fractional seconds

src/lib/util/boost_time_utils.*
    ptimeToText()
    durationToText() - added fsecs_precision parameter to control
    fractional seconds emission

src/lib/util/tests/boost_time_utils_unittest.cc
    TEST(BoostTimeUtilsTest, epoch)
    TEST(BoostTimeUtilsTest, bastilleDay) - revamped to test precision

[#174,!414] HA now logs server times along with skew

src/hooks/dhcp/high_availability/communication_state.*
    ComunicationState::setPartnerTime() - in addition to the skew
    it now retains current time and partner time

    CommunicationState::logFormatClockSkew() - now outputs current
    time and partner time, along with skew value

src/hooks/dhcp/high_availability/ha_messages.*
    HA_HIGH_CLOCK_SKEW
    HA_HIGH_CLOCK_SKEW_CAUSES_TERMINATION - modified to accomdate peer times

    HA_TERMINATED - reworded, as entering this state is a generic endpoint that
    may, in future be reached for reasons other than clock skew

src/hooks/dhcp/high_availability/tests/communication_state_unittest.cc
    TEST_F(CommunicationStateTest, logFormatClockSkew) - updated

[470-server-tag-get-command] Copied server-tag-get comments fro libprocess

[470-server-tag-get-command] Addressed comments about doc

[470-server-tag-get-command] Removed the -set stuff and updated doc

[470-server-tag-get-command] Added server-tag-get and prepared server-tag-set

[master] Fixed dhcpsrv/testutils compilation issue.

The mysql_generic_backend_unittest.cc is conditionally compiled when
MySQL is available.

[#680,!426] Added ChangeLog entry for #680.

[#680,!426] Addressed review comments.

- Added commentary to the subnetOptions and sharedNetworkOptions tests.
- Extended these tests to check that deletion of the shared network or
  subnet doesn't affect the options of the remaining shared network or
  subnet.

[#680,!426] Updated MySQL upgrade script from 8.1 to 8.2.

[#680,!426] Delete embedded shared network options when network is deleted.

[#680,!426] Deleted embedded DHCPv6 options when subnet is deleted.

[#680,!426] Delete embedded options when subnet gets deleted in mysql_cb.

updated copyright dates, added release statement to ChangeLog

updated release version in configure.ac

hammer: fixed building on debian buster

[#734,!422] Fixed filename in contribute.dox

    devel/contribute.dox - text had old file name, added " or:"

[#734,!422] contributors guide renamed to CONTRIBUTING.md

[#740,!427] Updated ChangeLog entry

[#740,!427] Added ChangeLog entry

[#740,!427] Addressed review comments

    src/lib/database/Makefile.am
    src/lib/dhcpsrv/Makefile.am
    src/lib/http/Makefile.am
    src/lib/stats/Makefile.am
    - Set age to 0 for reflect need to recompile:

    src/lib/process/Makefile.am
    - added interface, bump current and age

[#740,!427] Bumping library version numbers for 1.6.0-beta2

libkea_asiodns      -> no changes
libkea_asiolink     -> 7:2:0 (rule #3)
libkea_cc           -> 9:0:1 (rule #4,#5) Added BaseStampedElement class
libkea_cfgclient    -> 7:1:0 (rule #3) internal changes
libkea_cql          -> no changes
libkea_cryptolink   -> no changes
libkea_database     -> 3:0:1 (rule #4,#5) Support for Server objects
libkea_dhcp         -> 13:0:0 (rule #4) OptionDefContainer declaration changes
libkea_dhcp_ddns    -> no changes
libkea_dhcpsrv      -> 16:0:1 (rule #4, #5) ConfigBackendDHCPv* support for Server objects
libkea_dns          -> no changes
libkea_eval         -> 10:1:0 (rule #3)
libkea_exceptions   -> no changes
libkea_hooks        -> 7.3.0, bumped KEA_HOOKS_VERSION to 10
libkea_http         -> 6:0:1 (rule #4, #5) close_callback handler parameter added
libkea_log          -> no changes
libkea_mysql        -> 1:1:0 (rule #3) schema version was bumped
libkea_pgsql        -> 0:1:0 (rule #3) schema version was bumped
libkea_process      -> 4:1:0 (rule #3)
libkea_stats        -> 3:0:1 (rule #4,#5) Support for multiple data points per stat
libkea_threads      -> no changes
libkea_util_io      -> no changes, a Copyright year was updated
libkea_util         -> no changes, a typo in a comment was fixed
libkea_yang         -> 1:3:0 (rule #3)

[#741,!428] Fixed doxygen errors

Fixed two minor doxygen errors:
    src/hooks/dhcp/high_availability/ha_service.h
    src/lib/http/client.h

[#643,!421] Added ChangeLog entry for #643.

[#643,!421] Addressed review comments.

- Include "server-tags" instead of"server-tag" in the remote-network[46]-get
- Removed unnecessary escapes in the hooks-cb-cmds.
- Regenerated api.xml.

[#643,!421] Regenerated api.xml.

[#643,!421] Corrected JSON syntax in some of the API commands.

[#643,!421] Small corrections in the DHCPv4 CB text.

[#643,!421] Added a warning about misconfigurations when using server tags.

[#643,!421] Revised "Kea Configuration Backend" section.

[#643,!421] Added a note about shareable and non-shareable config in DHCP.

[#643,!421] Extended cb_cmds hook documentation with the server tags.

Each command description now comes with more examples of server tags usage
and the doc explicitly states when the server-tags are mandaotry and when
they must not be included in the command.

[#643,!421] Written section "Configuration Sharing and Server Tags".

[#643,!421] Removed the server tags from the CB limitations in the doc.

[#643,!421] Corrected introductory part of the cb_cmds doc.

Previously we used "server-tag" parameter in metadata, now we have
"server-tags" list.

[#643,!421] Editorial corrections in the cb_cmds docs for servers.

[#643,!421] Added documentation for the cb_cmds/server commands.

[#643,!421] Regenerated api.xml.

[#643,!421] Fixed JSON in remote-global-parameterX-del.json.

[#643,!421] Updated API docs for subnets management with tags.

[#643,!421] Updated API docs for shared networks managemen with tags.

[#643,!421] Updated API doc for remote global option commands.

[#643,!421] Updated API doc for option definitions.

[#643,!421] Updated API docs for global parameters setting.

[#643,!421] Created API docs for remote-server* commands.

[738-kea4-crash-when-remote-network4-del-command-is-issued-with-subnets-action-delete] Added ChangeLog entry for delete embedded subnet fix

[738-kea4-crash-when-remote-network4-del-command-is-issued-with-subnets-action-delete] Addressed final comments

[738-kea4-crash-when-remote-network4-del-command-is-issued-with-subnets-action-delete] Addressed comments

[738-kea4-crash-when-remote-network4-del-command-is-issued-with-subnets-action-delete] Fixed: use only ANY

[737-remote-option-def4-get-all-return-incorrect-tag-when-option-definition-is-configured-with-all] Added ChangeLog entry for MySQL CB option def get*

[737-remote-option-def4-get-all-return-incorrect-tag-when-option-definition-is-configured-with-all] Fixed option def get all query

[208-finish-move-logging] Improved log message

[208-finish-move-logging] Two other cases...

[208-finish-move-logging] Addressed comment

[208-finish-move-logging] Fixed libprocess - need d2 unit tests

[73-fix-covery-CID-1442796] Added initialization to 0 to next_host_id_ field of CfgHost

[606-drop-packets-in-drop-class] Added ChangeLog entry for DROP class

[606-drop-packets-in-drop-class] Addressed final comments

[606-drop-packets-in-drop-class] Addressed minor comments (checkpoint before rebasing)

[606-drop-packets-in-drop-class] Added DROP class (including doc and unit tests)

[701-sanitizer-logic-is-wrong] Added unit tests

updated ChangeLog, AUTHORS and addressed formatting

Support for storing more than one sample

[712-cb_cmds-add-support-for-server-tags-in-the-shared-networks] Improved supported selector comments