Stop trying to keep identifying files that has already failed
Each time I start my Zappiti, it starts a identify task, which is fine. But this task tries to identify all unknown files, even those that have been already tried and failed.
It should be stored in the database which files has already been tried identified and failed, so they don't have to be identified again.
This would mean that it should be possible, through the menus, to start an identify job that re-identifies all previously failed files.