Migrate from MySQL to Postgres

[thgoebel]

Helpful links:

• https://www.calazan.com/migrating-django-app-from-mysql-to-postgresql/
• https://gist.github.com/sirodoht/f598d14e9644e2d3909629a41e3522ad
• https://stackoverflow.com/questions/3034910/whats-the-best-way-to-migrate-a-django-db-from-sqlite-to-mysql

Work started on branch migrate-to-postgres.

[dsparber]

Done