Two minor enhancements to mod_rewrite: First RewriteRule now also supports the

Two minor enhancements to mod_rewrite: First RewriteRule now also supports the
``nocase|NC'' flag (as RewriteCond already does for ages) to match case
insensitive (this especially avoids nasty patterns like `[tT][eE][sS][tT]').
Second two additional internal map functions `escape' and `unescape' were
added which can be used to escape/unescape to/from hex-encodings in URLs parts
(this is especially useful in combination with map lookups).

Submitted by: Magnus Bodin, Ian Kallen
Integrated and fixed by: Ralf S. Engelschall

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82563 13f79535-47bb-0310-9956-ffa450edef68