* moved views methods in the specific model admins;
* added new admin tools to detect if user has permissions
	for specific actions
* added site filtering based on user roles over sites
* action checkboxes will not be available for core files
	and folders;
* actions will not be available when doing searches
* replaced all permission logic
* left all disabled actions commented and mostly unchanged;
	these will need to be changed if they will be
	enabled again