* Adapted Admin.link_macro() according to recent changes in HopObject.link_macro()
* Slightly modified HopObject.link_macro() in the compat layer to work with changes in Admin.link_macro()
* Updated and rebuilt i18n and message files
* Slightly modified the message informing about successful deletion of an object
* Fixed type when calling Membership.remove() in Site.unsubscribe_action() method
* Fixed bug causing exception when calling Membership.remove() method with no arguments
* FIxed still incorrect permissions for editing and deleting a membership
* Slightly increased sizes of some input elements for convenience
* Added SQL patch updating constraints of the membership role column (MySQL)
* Removed obsolete title and description properties from Layout
* Minor layout enhancements and wording edits
* Added markgettext_macro()
* Readjusted Admin.dropdown_macro() and the global defineConstants() methods to work with the modified markgettext() calls
* Updated Members.properties and added SQL patch for lowercasing all membership status due to the modified margettext() calls
* Added Membership.role_macro() as convenience method
* Removed syntactic sugar from HopObject.link_macro() and moved it to the compatibility layer to prevent current layouts from breaking
* Removed obsolete permission for non-existing Image.replace_action()
* Refactored Admin.queue(), Admin.dequeue() and Admin.purgeSites() methods to use new Admin.Job prototype
* Refactored Exporter and Importer objects to use new Admin.Job prototype (the way sites are im/exported still needs to be rewritten)
* Refactored resetting and importing a layout to always backup the current layout in a temporary ZIP file
* Moved import_action() method along with corresponding skins from Root to Site
* Moved #create skin from $Root to $Site
* Added the root site itself to the Root.sites collection
* Permitted deletion of the root site by adding appropriate checks and treatment in Site.remove()
* Moved call for Admin.dequeue() from scheduler() to nightly() method
* Removed obsolete Admin.importExport() method
* Removed obsolete app.data.exports and app.data.imports properties
* Modified default sorting of user list in $Admin#users skin. Fixes issue 70.
* Added property argument to HopObject.self_macro() to allow access to subnodes of the HopObject
* Replace macros directly accessing HopObject subnodes with <% this.self property %> ones
* Reverted changes made in r4026
