Fix all Metadata with Command
For the release 0.13 this command python manage.py fix_track_files
was introduced to fix the bitrate/size/duration-fields.
It would be nice to expand this command to fix other metadata too. For example with the fix of #220 (closed) the Tracknumber of MP3-files was fixed but it's currently not possible to retroactively fix this without reimporting everything.
Another case would be the album-cover-fix in 0.14, where a code-snippet to fix it manually was provided. This snippet could be integrated in fix_track_files-command too (or something similiar).