* Added kind of callback skin to HopObject#delete skin to include prototype-specific options in confirmation dialog
* Added content collection to Membership.properties
* Added check for req.postParams.mode in Membership.remove() – if it is set to "exhaustive" all contributions of the member to the site are going to be erased
* Added first draft of asynchronous site deletion using persisting, file-based job queue
* Moved programmatically created nightly cronjob to from global onStart() method to app.properties file
* Added helma.File.copyDirectory() method
* Revamping global breadcrumbs_macro() – WORK IN PROGRESS!
* Minor changes in global link_filter() and poll_macro() methods
* Added Root.SITEREMOVALGRACEPERIOD defining the grace period between request and actual time of site deletion
* Added Root.queue() and Root.dequeue() methods for handling job queue
* Slightly modified notfound_action() and error_action() of Root
* 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
* Moved the private copy() method in Root.create_action() to helma.File.copyDirectory() in Global.js (will be committed later)
* Replaced the copy routine with call for Layout.reset()
