- use category class in category admin and appbrowse
=> fix adding a category which was broken
=> fix deleting a category which was broken
=> fix editing a category which was broken
- use application/version/vendor class in scripts
- don't use a full table for queued appication but only one field in the application and version tables
- simplify the code in many places
- much improved application class (same model as the other new classes I made)
- modified category class
- modified some files to use the new classes and methods
- deletes linked elements on cascade
- removed appIdToName($appId) and versionIdToName($appId) from category.php
- replaced every occurence of appIdToName and versionIdToName with lookup_app_name and lookup_version_name
- drop version specific url
- let user add links for versions (installation, support, whatever)
- use application description and version description to display version description
- don't provide a link in the cat_path to go in the same page we already are
- various html improvement and fixes in modified lines
