Merge r1776575, r1776578, r1776624, r1776627, r1776674, r1776734, r1776740,...

Merge r1776575, r1776578, r1776624, r1776627, r1776674, r1776734, r1776740, r1778268, r1780725, r1781030, r1781031, r1781701, r1788674, r1789800, r1790169, r1790457, r1790691, r1806985, r1812332, r1818279 from trunk:

Merge new PROXY protocol code into mod_remoteip

Fix typo in mod_remoteip's doc

Shorten RemoteIPProxyProtocolEnable to RemoteIPProxyProtocol and correct references in docs

Move attribution for mod_remoteip RemoteIPProxyProtocol from file to CHANGES

On the trunk:

* mod_remoteip: added cast to fix clang compiler error



Reinsert attribution to mod_remoteip.c for PROXY protocol

* Silence compiler warning

Set all read buckets aside in case we need to restore all during optional header processing

* modules/metadata/mod_remoteip.c: Fix GCC strict-aliasing warning
  by moving deference of header array via a different pointer type 
  ("type-punning") out of line.


* modules/metadata/mod_remoteip.c (register_hooks,
  remoteip_hook_pre_connection): Reference the filter by handle rather
  than ...