simplify JavaScript loading

Ignore-this: 7637977e042ed8ba7e9e9097f9e9f03f

This patch removes the differences between the JavaScript loaded in
edit and view modes.

  * increases the amount of JavaScript that is loaded initially
  * decreases the number of requests
  * only one cache for all javascript
  * all javascript is available in view mode

The last point is the most important as it makes a lot of functionality
available to plugins working in the view mode. The discussion plugin
now can reuse the toolbar code for example.

Note: development is part of ICKE 2.0 project
      http://www.icke-projekt.de

darcs-hash:20090812194007-6e07b-c8a71dedf506065a95d8b84b55aafce67810236c.gz