TMSS-64: profile -> pulsar profile to be more explicit and clear. no need is foreseen to ever mix pulsar profiles with other profiles

TMSS-64: Parset keys for dataproduct lists are now generated by a function, removing a lot of code duplication.

TMSS-725: processed review comment: split the ERROR state into (generic)ERROR and UNSCHEDULABLE which are both end-states.

TMSS-725: processed review comment. moved set_subtask_state_following_allowed_transitions into test_utils so that it is clearly intended to be used in tests only, and not in normal tmss code. Took the opportunity to move the TMSSTestEnvironment into its own module as well to make a clear distinction between test-helper-methods (in test_utils.py) and the TMSSTestEnvironment (in test_environment.py). Adapted all tests with new import paths.

TMSS-725: fixed tests, and added convenience method to set a subtask to a desired state following the allowed transitions.

TMSS-725: added a SubtaskAllowedStateTransitions table, populate it with the allowed state transitions, and raise an exception if a user tries to submit an illegal state transition

TMSS-725: initial database trigger for blocking illegal subtask state transitions. TODO: add all transitions according to design

TMSS-216: fixed tests and updated templates accoring to adjustments to TaskConnectorType and TaskRelations

TMSS-216: removed dataformat property when creating TaskRelations. Added TaskRelations to the cleanup convenience method, and added a big rationale explaining it's usage

TMSS-216: as discussed with the architect, a TaskConnectorType now only has one Dataformat, and the Dataformat is not needed anymore on the TaskRelation.

TMSS-216: added initial version of method create_cleanuptask_for_scheduling_unit_blueprint to create a cleanuptask (and subtask) and add it to the schedulingunit. During implementation I discovered that the TaskConnectorType is used wrongly in the specification model. The connector should be a property of the TaskTemplate, and the TaskRelation between two Tasks can then be made between Tasks with the correct/fiting connectortypes.

TMSS-520: change Flag to SystemSettingFlag and unique ForeignKey reference to OneToOne, also create fresh migrations