Add the experimental snapshot interface. Because it is experimental, it is

subject to change or removal at a later date.

FossilOrigin-Name: 9b124a5a310aec0145495c9980bc0c1308fcca02

diff --cc manifest
index 2ac6ff316f06993c4a69cc6cded6da2785441daa,268c0bf42dd09d2057448c7ac43d4cec5479a0fd..04d3534b4d509ac54d297f6119668f278351dfe9
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sa\smemory\sallocation\sbug\sintroduced\slast\sweek\sby\scheck-in\n[a9e819082ba].\s\sThe\sbug\sonly\sappears\son\ssystems\swhere\sthe\ssize\sof\sa\sstructure\nis\snot\salways\sa\smultiple\sof\s8\s-\swhich\sin\spractice\smeans\sonly\son\s32-bit\s\nwindows\ssystems.
- D 2015-12-11T04:11:17.453
 -C Mention\sthat\sthe\ssnapshot\sinterfaces\sare\sonly\savailable\sif\sSQLite\sis\scompiled\nwith\sSQLITE_ENABLE_SNAPSHOT.
 -D 2015-12-11T03:27:36.868
++C Add\sthe\sexperimental\ssnapshot\sinterface.\s\sBecause\sit\sis\sexperimental,\sit\sis\nsubject\sto\schange\sor\sremoval\sat\sa\slater\sdate.
++D 2015-12-11T12:44:52.505
  F Makefile.in 28bcd6149e050dff35d4dcfd97e890cd387a499d
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc e8fdca1cb89a1b58b5f4d3a130ea9a3d28cb314d
@@@ -304,8 -304,8 +304,8 @@@ F src/insert.c e1d20ae8979e25519c267023
  F src/journal.c b4124532212b6952f42eb2c12fa3c25701d8ba8d
  F src/legacy.c ba1863ea58c4c840335a84ec276fc2b25e22bc4e
  F src/loadext.c 84996d7d70a605597d79c1f1d7b2012a5fd34f2b
- F src/main.c a950e48920e8c0f0ff82b2b2ccfe11aa89ca11d4
+ F src/main.c 2f33510a6a392c606fe64964e695e55ad124242f
 -F src/malloc.c 337bbe9c7d436ef9b7d06b5dd10bbfc8f3025972
 +F src/malloc.c 8f787669e79de26efc42272b5797bc00fff527c6
  F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
  F src/mem1.c 6919bcf12f221868ea066eec27e579fed95ce98b
  F src/mem2.c f1940d9e91948dd6a908fbb9ce3835c36b5d83c3
@@@ -341,10 -341,10 +341,10 @@@ F src/resolve.c a83b41104e6ff69855d03cd
  F src/rowset.c eccf6af6d620aaa4579bd3b72c1b6395d9e9fa1e
  F src/select.c f8fded11fc443a9f5a73cc5db069d06b34460e2f
  F src/shell.c abbc74ea43dbf2f306ea18282d666683fb5efab2
- F src/sqlite.h.in 1248a78548024bdc8ef5893faa0ff9552b4cceb4
+ F src/sqlite.h.in 7d87d71b9a4689c51fa092f48f16590ff71558e3
  F src/sqlite3.rc 992c9f5fb8285ae285d6be28240a7e8d3a7f2bad
  F src/sqlite3ext.h dfbe62ffd95b99afe2140d8c35b180d11924072d
 -F src/sqliteInt.h 5caacf37a776f9d6178e519cb0b5248ca22a3828
 +F src/sqliteInt.h beb4a63b94428f52a3d7c7af2ba8bdc7d4682a03
  F src/sqliteLimit.h 216557999cb45f2e3578ed53ebefe228d779cb46
  F src/status.c 70912d7be68e9e2dbc4010c93d344af61d4c59ba
  F src/table.c 51b46b2a62d1b3a959633d593b89bab5e2c9155e
@@@ -1408,7 -1410,7 +1410,8 @@@ F tool/vdbe_profile.tcl 246d0da094856d7
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 05bc4f920ce23da48d1da6cd36a956fd6fd7c862
- R bb8ff31fbee90cb95998ef6668cbcbeb
 -P 5fd008f0433833e4341d526dcc2387570ffe1fea
 -R debac3c9c8655611fddbcca7514e6f4e
++P 96d3e99ffe59b5280b8b7fc269c94a72e15c345b 843c15a552657ca43ff200edb7da7566752d7941
++R 1e8a48e65f87836435758a04b37e3926
++T +closed 843c15a552657ca43ff200edb7da7566752d7941
  U drh
- Z dbc67560cb8111f117bbc951b94851d2
 -Z a48afa3f9104a922fecee9583a7109ec
++Z f796eddbea3599c0fdbed9d3e73688d6

diff --cc manifest.uuid
index 1ada9da49b437376f277f1865c6bd9c808dbeeb7,b9d344ad3f42b7ccb1b51413e2e333d491507bd6..bcf7d5193b2a076a173d89a33a876ccefb63ee2e
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 96d3e99ffe59b5280b8b7fc269c94a72e15c345b
 -843c15a552657ca43ff200edb7da7566752d7941
++9b124a5a310aec0145495c9980bc0c1308fcca02