TMSS-1123: run populate_subtask_allowed_state_transitions_extra in new migration (0002_populate was already applied to all current tmss db's

TMSS-605: Add check for stations in use when saving reservation, and fix reservations tests which were a no-op so far

TMSS-1123: Add populate_subtask_allowed_state_transitions_extra for the new added state transitions migrations

TMSS-1093: the symlink and the cmake install fight over which file/dir gets actually installed. Got rid of the symlink in the binary dir. cmake install now properly installs the json schemas in the correct dir. Use the source-schema-dir for tmss_test_environment

TMSS-1121: added convenience is_obsolete property to TaskBlueprint. Ignore obsolete tasks in specifications_doc_including_copies_for_failed_tasks

TMSS-1093: the symlink and the cmake install fight over which file/dir gets actually installed. Got rid of the symlink in the binary dir. cmake install now properly installs the json schemas in the correct dir. Use the source-schema-dir for tmss_test_environment

TMSS-1117: try to schedule newly created subtasks when all its predecessors are finished or obsolete

TMSS-1117: use transactions. If one task/subtask creation/update fails, then rollback the whole transaction