v2.0.0

This is the second major release of Caluma.

Apart from a couple of new features, we changed the license from MIT to AGPL.
The reasons for this are documented in a followup (see #749).

There's another backwards-incompatible change regarding the data sources for
dynamic (multiple) choice questions, prompting the version bump.

New in this version is also the separation between ordering and filtering in the queries,
and a cleanup command for historical data.

Feature

• pass actual answer value to data source (3b26162)
• add order filter for workflow models too (b2fb9c7)
• add test for new order filters (344bc9d)
• introduce new-style ordering for form nodes (f73f8e5)
• implement new order filter (012d1f1)
• start using the collection filterset factory (97394c7)
• factory for unionized filters (686484d)
• expose original document id (051cf01)
• add cleanup command (a66582a)

Fix

• typo (9cd21c1)
• link guide (57df4a6)
• don't pass self to super().init() call (748c99d)
• correct svg font (576e2fe)
• cleanup_history - add force argument (9191b4e)

Breaking

• DataSource.get_data() methods must accept an optional answer_value parameter. (3b26162)
• License change: Move to AGPL (bfb6619)

Documentation

• update ordering documentation (85a1143)
• add note on deprecation of old-style filters (b93e27c)
• extend the guide with form-builder steps (bdd183d)
• add guide (WIP) (822f4c1)
• document cleanup commands in README (dc58593)