The package license (AGPL3+) implicitly indicates the license of each
file. However, it is desirable to have license headers in each file.
This is the case for many prominent projects like GNU project, Mozilla
etc.
- Remove dependency on withsqlite and use Django models.
This avoids depending on a module that is not available in PyPi.
Withsqlite does not have Python3 support. It does not work when
we choose a different database backend. Atleast partly duplicates
what Django models are meant for.
- Check and update database schema on every run so that
newly added modules can add tables and old ones can update.
