Item12481: 

   * new 404 page
   * displaying a 404 page instead of an expensive create-new-topic page 
   * made all templates in the System web readable by everybody in case the System web is locked down otherwise
   * reworked grid framework
   * improved Base theme
   * improved browser detection
   * added optional busy indicator of ajax requests
   * improved random passwd generator in user registration view
   * jslinted and fixed all js
   * improved subscribe js, not relying on SubscribePlugin anymore
   * removed overfull bottom bar section
   * rewrite of USERACTION templates
   * improved WikiGroups view templates
   * improved integration with TopicInteractionPlugin in WebDAV-setups
   * added microdata where appropriate
   * adding jquery-ui tooltips where helpful to improve usability
   



git-svn-id: http://svn.foswiki.org/trunk@17164 0b4bb1d4-4e5a-0410-9cc4-b2b747904278