LUN-1116: current site folder filtering when selecting filer objs.
* actions for files/folders are now hidden when selecting filer
	objects for plugins
* actions available: make subfolders, upload files, move from clip
* changed redirect for file/folder admin to be the same
LUN-1118: generated deletion link was incorrect for file subtypes
Forbidden is thrown if trying to change a file without permission
	on its folder.