Migrations with major changes #70
Description
- Use locations throughout to represent subsequences #66
- Migration: in genomecoords, change from start, end, strand to location. Make it required.
- Merge GenomeCoordinatesSource with Genbank accession #65
- Migration: move from RepositorySource to this, add optional location field.
- ManuallyTypedSource - Drop all values #69
- Migration: drop all values