Update - Posixldapauth fix for unusaual AD group layouts. Also added checkbox to append domain name to username on AD login

git-svn-id: http://svn.resourcespace.org/svn/resourcespace@5487 c08608d7-6e46-0410-86ca-f2a6f1370df5
FIX: Posixldapauth now escapes required characters for AD search

git-svn-id: http://svn.resourcespace.org/svn/resourcespace@5488 c08608d7-6e46-0410-86ca-f2a6f1370df5