Retribution Update

- Removed table eveIcons
- Removed table eveGraphics
- Removed eveIcon and eveGraphic relations
- Removed column icon from invTypes
-> All this data can be found in YAML files now

- Added missing migration
- Fixed description column of invMarketGroups
- Fixed various columns of CrpNPCCorporation
- Updated admin classes

If the import fails with a 'django.db.utils.IntegrityError: duplicate key value violates unique constraint' error, just run it another time until all tables are imported properly. You should use the -s [table-to-start-from] parameter to save you some time.