SW-279: merged ltastorageoverview feauture branch into trunk. Merged from https://svn.astron.nl/LOFAR/branches/ltastorageoverview-Task8721@39713

Task #10099: entered alteration for observers to be able to add history and search on history with alarming

Task #10099: entered alteration for observers to be able to add history and search on history with alarming

Task #0000: Fixed order of libraries in FindWINCC to resolve link error in GCF/PVSS against WinCC 3.12.

Task #8721: SW-280: processed review comment: added some tests for the scraper Location class. made some minor changes to the scraper module. Not going to do a full refactoring; I agree some methods in scraper.py are too big, but they are self contained and not part of a public API. So it's good enough for now.

Task #8721: SW-280: processed review comment: removed user input and possibility to wipe production database. performance test now runs on a fresh database test instance

Task #8721: SW-280: processed review comment: moved big test into seperate integration test file. added explanation for parts of the bigger test.

Task #11004: replaced erroneously used c++ HAVE_QPID variable by an actual test if the qpid daemon is running on this system