* Metadata is now written to its own table instead of a column only
* Values are saved as JSON-like structure only for certain types (like Array or Function)
* Adding custom metadata is more generic using the new HopObject methods setMetadata(), getMetadata() and deleteMetadata()
* Searching keys and values via common SQL query is much more straightforward (no JSON-like structure involved when basic types like String and Number)
* Added second argument to HopObject.remove() method; if set to true, any object will be removed without any checks for permissions or the like
* Enhanced notfound and error screens
* Removed obsolete Image.site property
* Added missing LogEntry.remove() method
* Added Site.deleted property
* Fixed missing calls for remove() methods of some collections in Site.remove()
* Added Root#stylesheet skin for future CSS classes necessary for GUI elements
* Added missing Site.entries collection
* Removed troublesome if condition in Skin.remove()
* Generally deny access to Skin.main_action
* Added missing Skin.getFormValue() method
* Added check in Skin.update() if the Site#page skin contains the <% response.body %> macro
* Added Skins.onRequest() method checking if we are in-between two Skins objects
* Disabled ip address property in LogEntry (will be removed in the long run)
* Removed custom property from Skin (still needs some care)
* Removed commented code
* Added work-around for Helma bug #607 by calling persist() on creating a story or an image before setting the tags
* Fixed sequence of clipping/embodying and tag stripping in Story.getTitle()
