Add 'New features of 2.1/2.2' to index page.

Add reference to htcacheclean in mod_disk_cache docs via program.  (Yay, nd!)
Update transformations.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@106861 13f79535-47bb-0310-9956-ffa450edef68