* Removed obsolete navigation skins
* Moved page navigation skins into Global.skin
* Removed remaining obsolete RSS skin
* Moved admin navigation into subskin and added it via overwritten skin_macro in Admin prototype
* Removed obsolete sysmgrnavigation.skin from Root
* Renamed style.skin to stylesheet.skin (this could be hazardous regarding b/w compatibility...?)
* Modified order of featured collection in Stories prototype
* Re-added DB column and property for last visit date of a user (now simply called "visited")
Switched to Rome for RSS generation:
* Added necessary JAR files (new subdirectory "lib")
* Removed obsolete skin files
* Added basic skins for XSL transformation
* rss.xml of Root prototype is now equal to the one of Site; site updates have been moved to updates.xml