TMSS-770: Update get_subs_and_durations_from_project by splitting SUBs in Prio A,B and switching to observed_durations

Resolve TMSS-857

Closes TMSS-857

See merge request !516

TMSS-876: allow header test

Closes TMSS-876

See merge request !515

TMSS-876: rename test so it can be run independently, add tests for Access-Control-Allow-methods header

TMSS-857: Update distinction between successful/failed observations for the reporting (workflow flag)

TMSS-745: Responsive Telescope

Closes TMSS-745

See merge request !504

Resolve TMSS-655

Closes TMSS-655

See merge request !509

Resolve TMSS-820

Closes TMSS-820

See merge request !507

TMSS-745: lenght of test and number of created instances has effect on GET-lists due to pagination. Fixed.

TMSS-745: skip templates  which have no known scheduling_constraints_template which can be used while dynamic scheduling

TMSS-745: fixed inheritance for Meta class in various models. Otherwise base Meta properties (like constraints) are missed.

Resolve TMSS-708

Closes TMSS-708

See merge request !508

TMSS-745: pulled out common version number code for templates, and applied it to SchedulingUnitObservingStrategyTemplate as well.

TMSS-462: Added access-denied page component. Changed access-control api call...

Closes TMSS-462

See merge request !511

TMSS-745: extract scheduling_constraints_doc and scheduling_constraints_template from submitted template and use it.

TMSS-462: Added access-denied page component. Changed access-control api call URL to fetch only one field.
Rerport test data updated.

TMSS-745: when no such template available... get a list of all templates and print it, so the user can lookup the one that he wants