TMSS-435: Return json object with sunrise, sunset, day and night times at sun_rise_and_set call, handle multiple stations and timestamps provided as parameters

TMSS-322: reimplemented this feature. As stated in the ticket: such a convenience log_url is not part of the Subtask model, but can be a view on the model. So, implemeted it in the viewset. Now, fetching subtasks from the TMSS db is superfast again.

(cherry picked from commit 3bec3e06)

TMSS-403: Improvement: use build/installed TMSS settings module and LOFARROOT for static files and templates so that django toolbar and frontend work out of the box

TMSS-337 Add testcase for checking relative_start/stop_time and observation_end_time using UC1 stategy template

TMSS-337 Remove 'default' value in SchedulingUnitBlueprint and add propertyobserved_end_time in TaskBlueprint

TMSS-334: bug fixes and typos on previous quick performance fix. There are many more optimization opportunities!

TMSS-334: quick performance fix with big speedup in getting taskblueprints and schedulingunitblueprints. There are many more optimization opportunities!

TMSS-324 Add SIPIdentifier table. Add global_sip as foreignkey to the SubTask, Dataproduct and SAP table. Remove identifier from SAP specifications_doc because its in model now.

TMSS-379: adated task->subtask method to new station schema. added ToDo for TMSS-382 follow up ticket.

Changes Updated

TMSS-379 Use correct default station group settings for UC1. Determine station list for subtask with updated station specifications using group and list.

TMSS-315: remove station list from antennas structure in SAP specifications_doc; merge json with equivalent structure in feedback