Merge r1493330, r1504276, r1552227, r1551714, r1490994, r1172732 from trunk:

Merge r1493330, r1504276, r1552227, r1551714, r1490994, r1172732 from trunk:

Correct typo in error message

Unlikely potential memory leak.
Point 12 of PR 54936

Remove <Proxy ~ wildcard-url> syntax which:
   - is equivalent to <ProxyMatch wildcard-url>
   - has never been documented
   - incorrectly checks parameters (!cmd->path should be !cmd->path[0])
   - is buggy (! is missing in front of strncasecmp)

Avoid sending back uninitialized memory, use 'ftpmessage' in order to have something meaningful instead.

Save 8k of stack by the same time.

NULL terminate the right buffer

Fix issues found by PVS-Studio static analyzer:

mod_mime_magic:
cut'n'paste error rsl_encoding vs. rsl_separator, also simplify code a bit

mod_header:
wrong string initialization (leading to segfault if format argument is missing)

util_win32: duplicate sizeof (untested; Windows people, please review)

PR: 51542
Submitted by: Andrey Karpov <karpov viva64 com>, Stefan Fritsch

Reviewed by: jailletc36, rpluem, wrowe

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1576709 13f79535-47bb-0310-9956-ffa450edef68