[FIX] ajax edit categories: refresh page when ajax complete to avoid inconsistent information left on the page, and remove jquery no longer needed as a result; dim clicked item more precisely when processing; use new csrf system; provide better feedback when attempting to delete an object from a category it is not in or when adding to a category the object is already in; exclude from list of objects things that cannot be recategorized and make it clearer what filters have been applied; other minor refactoring