Merge branch 'TMSS-682' into 'master'

SAS/TMSS/backend/src/tmss/tmssapp/migrations/0001_initial.py

SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py

SAS/TMSS/backend/src/tmss/tmssapp/populate.py

.../tmss/tmssapp/schemas/reservation-strategy-ILTswitch.json

...mss/tmssapp/schemas/reservation-strategy-VLBIsession.json

...s/tmssapp/schemas/reservation-strategy-core-stations.json

...mss/tmssapp/schemas/reservation-strategy-maintenance.json

...mss/tmssapp/schemas/reservation-strategy-overheating.json

SAS/TMSS/backend/src/tmss/tmssapp/schemas/templates.json

...MSS/backend/src/tmss/tmssapp/serializers/specification.py

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/specification.py

SAS/TMSS/backend/src/tmss/urls.py

SAS/TMSS/backend/test/t_reservations.py

SAS/TMSS/backend/test/t_tasks.py

SAS/TMSS/backend/test/t_tmssapp_specification_REST_API.py

SAS/TMSS/backend/test/tmss_test_data_django_models.py

SAS/TMSS/backend/test/tmss_test_data_rest.py

SAS/TMSS/client/lib/populate.py