Merge r1356115, r1356813, r1086662 (tiny subset), and r1032431 from trunk:

mod_rewrite: Add "AllowAnyURI" option. PR 52774. [Joe Orton]

mod_rewrite: Fix the RewriteEngine directive to work within a
location. Previously, once RewriteEngine was switched on globally,
it was impossible to switch off. [Graham Leggett]

Reviewed by: rjung, wrowe, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1375113 13f79535-47bb-0310-9956-ffa450edef68