TMSS-287: added Quantity AbstractChoice model, and used it in ResourceType to annotate each resource type with the correct quantity.

TMSS-287: upon request of the frontend team, added more test data and added some scheduled/blueprinted tasks as well. Use TMSS_UNIT_TESTING envvar to skip expensive example data setup.

TMSS-287: indicate (via environment var) that we are using the TMSSTestEnvironment during unittesting.

TMSS-286: use the RelationalHyperlinkedModelSerializer so we always get both the pk and url, and we get additional _value fields for enums

TMSS-221: Fix nested url for listing projects in a cycle when cycle name contains a space. Also allow filtering project list by cycle via url parameter.

TMSS-272: Move antenna_set, filter and station list to common json schema. antenna_set en filter combined as one (ref-)object. Issue with oneOf and ref makes station list not common yet.

TMSS-241: remove units from resource models (which should always be in SI/base units on the DB level)

TMSS-152: refactored observation task->subtask specification conversion, so it's more generic, and easier to read.

TMSS-152: added test_create_task_blueprints_and_subtasks_subtasks_from_scheduling_unit_draft_with_UC1_requirements