Item10186:

   * fixing restore from old revision
   * deprecated IE6-8 by default
   * using dedicated skinjs and skincss render zones to ease customizing other plugins' css



git-svn-id: http://svn.foswiki.org/trunk/NatSkinPlugin@16602 0b4bb1d4-4e5a-0410-9cc4-b2b747904278