core: ErrorDocument now works for requests without a Host header.

PR: 48357

Submitted by: trawick
Reviewed/backported by: jim


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mod_include: When an include file or virtual path fails, include the result
code that tells us why.

Submitted by: minfrin
Reviewed/backported by: jim


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mod_include: When +Includes is not set and we disable mod_include, tell
the administrator where this happened.

Submitted by: minfrin
Reviewed/backported by: jim


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Add in new type CLEARINUSE which allows the inuse table to
be cleared upon storage. This may be expected/wanted/required
by some applications

Reviewed/backported by: jim


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WinNT MPM: minor improvements

Reviewed by: gsmith, rjung


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* server/mpm/prefork/prefork.c (child_main): Don't log errors for an
  apr_pollset_add() failure if a graceful-stop has been signalled.

follow up to r1387633: use the right exit code depending on the error scenario

Submitted by: jorton, trawick
Reviewed by: trawick, minfrin, jorton


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trunk patch: http://svn.apache.org/viewvc?view=revision&revision=1386576
             http://svn.apache.org/viewvc?view=revision&revision=1386578
2.4.x patch: trunk patch works
+1: jim, druggeri, minfrin


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stale content because of a proxy error. PR 53539. Correction to r1361153.
trunk patch: http://svn.apache.org/viewvc?view=revision&revision=1373447
2.4.x patch: trunk patch works.
+1: rjung, jim, minfrin


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More consistent return errors...
Reviewed/backported by: jim


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