Remove the catalog item from the database and disk. This method normally tries to remove the physical file first, and if that succeeds it removes the database record. If $deletefile is false then the file will be left and only the DB record deleted.
Define the list of user categories which is used to categorise the catalog items in this catalog. This is submitted as an associative array with a single word string as key, and a multi-word string as the value (category description).