* Core folder files => readonly + no submission in view;
* Restricted permissions in core folders for 'single file'
	move to clipboard;
* Added file name validation on move action;
* Added restricted on extracting archive files;
* Files with name confliction on 'move from clipboard' will not get
	deleted anymore;
* Some folder functions/buttons will no loger appear in template
	if folder is core folder ;
* Code refactoring in admin tests;
* Added some helper functions for admin tests;
stupid 'self' instead of awesome 'TestCase'