Merge r1572905, r1595305, r1597182, r1586827, r1534892, r1563193, r1597639 from trunk:

Merge r1572905, r1595305, r1597182, r1586827, r1534892, r1563193, r1597639 from trunk:

core: avoid a double apr_time_now() call on the first succeeding read.

* Correctly escape user provided data.

PR: 56532
Submitted by: Maksymilian <max cert.cx>
Reviewed by: rpluem

Save a few bytes of memory. This can be done in temp_pool.

Fix layout

don't pass uninitialized rv passed to ap_log_rerror()
  (rv wasn't interesting / follow an existing example)

stop throwing away a pointer on the heap

(clang scan-build)

add the URI to DEBUG message 00765 (and drop an exclamation point):

  Cache provider's store_body failed!

Doxygen fix + reorg to match how other header files are built
Submitted by: ylavic, rpluem, jailletc36, jailletc36, trawick, covener, jailletc36
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1603141 13f79535-47bb-0310-9956-ffa450edef68