This fixes the hiding of the highlighting of the current section when
the mouse leaves the edit section button.

  * Fix selector in subtree loading callback
  * Remove HTML inconsistencies between AJAX and plain PHP lists
  * Unify icon and CSS class switching in dw_tree and dw_mediamanager

Make it faster, prettier, less wrong, add UI effects, use jQuery UI Dialog,
Abstract tree view stuff away into jQuery.dw_tree

There are probably more functions that should go in here

The ajax quicksearch sent a request on every keystroke instead of
waiting for the user to stop typing.

  * Increase HTTP cache time since the resources are timestamped on request
    anyway
  * Check userscript.js only once for JS cache validation
  * Use cache class

  * Move file to qsearch.js
  * Rename object to dw_qsearch
  * Remove unnecessary usage of Delay
  * Use $ prefix for jQuery objects
  * Fix result list hiding on click
  * Fix namespace shorting

  * Add var statement for dw_behaviour
  * Use live instead of click for smb share warnings

  * Remove jQuery to $ wrapper function
  * Add $ prefix for jQuery variables
  * Make some jQuery calls faster
  * Use slide animation

  * Removed "use strict" statement, since it does not work with our script file
    joining (the statement has to be the first in a file or function)
  * Make index a global object again to allow overriding and enhancing
  * Use prefix dw_ for index object
  * Reintroduce index.treeattach
  * Support deprecated index.toggle calling convention
  * Add $ prefix for jQuery variables
  * Use slide animation for freshly loaded sublists as well
  * Fix various errors

The feature is now disabled by default.
Metadata for config manager was added.