Removed plugin functionality, transformed Section no base upon MPTT, no
more Section nodes. Brakes compatibility - changes aren't
backwards-compatible, needs data migration.
PEP8zed models. Removed file-related code.
Removed tests directory, why lie to ourselves, we don't have any tests.
Yet.
Removed testproject, it's broken. Adjusted requirements.
Removed pdf generation, binary data shouldn't live here.
Version bump.
Merge branch 'feature/denormalization'.