Fs file delete

deleteQuietly was being used to delete upload files following the delete of an image. This meant that if a file delete failed it was not being caught and added to the _fs_deletelog on the db. This PR should fix that by using the return value of deleteQuietly.

The easiest way to test this is to:
 * import an image,
 * lock all or some of the files that were uploaded to the repository,
 * delete the image.
 * using sql should show the undeleted files in _fs_deletelog
 * the blitz log should also record the failed deletes