add some doc regarding new import_gogglesmm12.py script
Add some checks to prevent empty tags being inserted in the database. Also added database upgrade fix to remove any existing empty tags. This fixes #10 in which an empty tag caused the application to crash.
Merge branch 'develop' of https://github.com/gogglesmm/gogglesmm into develop
Mark file removal as changed so proper db cleanup is achieved. Fixes lingering album entries
Load/Save year display in album list as user preference
Use set_null api to set fields that may be null
Change default menu title mask
Remove version test for FOX-1.6
don't support musepack at this time
Some minor source code cleanups
prepare release
v0.13.0rc4