Resolve SW-826

See merge request !69

SW-826: adding Casacore.casa as dependency on LCS/Common makes many lofar libs dependend on 3rd party libs which we don't actually use. This hinders us in deployment and maintenance on various systems. Hence, I removed the hard dependency on Casacore.casa, and made the empty-stub-CasaLogSink print out a warning message to cerr.

SW-826: adding Casacore.casa as dependency on LCS/Common makes many lofar libs dependend on 3rd party libs which we don't actually use. This hinders us in deployment and maintenance on various systems. Hence, I removed the hard dependency on Casacore.casa, and made the empty-stub-CasaLogSink print out a warning message.

SW-826: only insert predecessor/successor links into the radb when needed, thus preventing unneeded error log lines about duplicate keys

SW-826: fixed the taskprescheduler by letting it respond to RA.TaskApproved events and by NOT inserting/updating the task into the RADB.

SW-826: the taskprescheduler should NOT insert the task into the RADB. Added that requirement to the test, which now fails. Next commit has the fix for this bug.

SSB-102: (also misspelled in the commit logs as SBB-102): reverted the work of SSB-102 from LOFAR-Release-4_0, because it block the station software from starting up. This feature is a good idea, but the implementation is far from complete/robust/bug-free. Joern/Thomas/Sander's work is not lost, but can be found in the git history and can be reused in a next attempt to implement the TBB trigger feature.

SW-818: had to mock away an ssh call to lcu as well.

See merge request !65

SW-818: fixed t_trigger_service.py and made sure that Popen is mocked away so...

See merge request !63

SW-818: fixed t_trigger_service.py and made sure that Popen is mocked away so the test does not make acual calls to the tbbctl.

SW-818: Resolve SW-818

See merge request !61

COB-23: Station->COBALT2 mapping after fully wiring COBALT2. Simpler...

See merge request !60

COB-23: Station->COBALT2 mapping after fully wiring COBALT2. Simpler configuration and better load distribution.

SW-818: fixed programs tbbservice_start_datawriters tbbservice_stop_datawriters, and fixed various minor typo's/config issues in tbbservice

Resolve SW-816

See merge request !57

SW-816: TaskPrescheduler now supplies the Specification class with an RADatabase instance instead of an RADBRPC

SW-816: reused radb connections. Testing showed that opening/closing db connection too quickly in succession can lead to timeouts while waiting for sockets in TCP_WAIT state.

SW-816: implemented truncate trigger which cascades a truncate on resource_claim to resource_usage and resource_usage_delta

COB-69: Merge branch 'COB-69-fix-tests' into 'LOFAR-Release-4_0'

See merge request !58

SW-816: improved speed of the RADBCommonTestMixin by only creating a postgres instance upon setUpClass, and applying a fresh radb schema every test via setUp