Easy patches: synch 2.4.x and trunk

Easy patches: synch 2.4.x and trunk
   - core: 80 chars
   - http_core: Clean-uo and style. No functional change overall
   - http_core: One more style fix in ap_process_http_async_connection()
   - mod_mime: Fix a cppcheck warning
   - mod_proxy_ajp: Fix a harmless clang warning
   - suexec: avoid a potential sprintf overflow
   - mod_headers: This is harmless, but this really should be an 'echo_do *'
   - core: Fix typo
   - core: Update a comment about the 'PATCH' HTTP command
   - mod_proxy_balancer: Fix some HTML syntax issues
trunk patch:
   - http://svn.apache.org/r1780282
   - http://svn.apache.org/r1814659
   - http://svn.apache.org/r1814660
   - http://svn.apache.org/r1838285
   - http://svn.apache.org/r1842881
   - http://svn.apache.org/r1846253
   - http://svn.apache.org/r1853757
   - http://svn.apache.org/r1851702
   - http://svn.apache.org/r1853980
   - http://svn.apache.org/r1855614
2.4.x patch: svn merge -c 1780282,1814659,1814660,1838285,1842881,1846253,1853757,1851702,1853980,1855614 ^/httpd/httpd/trunk .
+1: jailletc36, jim, rjung

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1860129 13f79535-47bb-0310-9956-ffa450edef68