Allow to set $pagename via URL query 'pagename=x'.


git-svn-id: http://svn.montala.net/svn/resourcespace@4604 c08608d7-6e46-0410-86ca-f2a6f1370df5
Fixed the filterbox plugin to work as intended with dynamic page loading.

* The reload_searchbar.php is now loaded overriding $pagename which makes sure
  hooks in plugins will continue to work.
* Fixed and improved the filterbox plugin to show/hide when needed; it will now
  quickly fade in/out if you have JavaScript enabled.
* Also, actually filtering the current search results is working again as it
  should.


git-svn-id: http://svn.montala.net/svn/resourcespace@4605 c08608d7-6e46-0410-86ca-f2a6f1370df5