Clean up generic checks

[margrietpalm]

Before the upgrade several checks were created based on attributes of the columns:

• ForeignKeyCheck (0001) for all columns with foreign_keys
• UniqueCheck (0002) for all columns with unique or primary_key
• NotNullCheck (0003) for all columns with nullable

Except for id and geom columns, these checks are no longer automatically generated and some may have been missed. Furthermore, the ones that are there are scattered.

Tasks:

• List which columns should be covered in checks 1, 2 and/or 3 (based on docs for 219)
• Collect and add these in one and only one place in config.py (consider using a separate file to create these lists for easy maintainance)