SW-699: be explicit about which python boost component to use. If python3, then spcifiecy python3 and then the normal cmake FindBoost can find the appropiate boost-python3 lib.

SW-657:  Add the CEP4 optimisation target also to GNUCXX11 and move the CEP4 optimisation target to its own variants file

SW-657:  Add a new build variant for CEP4 optimisation to GNUCXX11_2018 and remove -Wno-terminate c++ option to enable warnings for throw statements in dtors

SW-699: added messagelogger which can listen and log all (or filtered) messages from an exchange. Useful for debugging/tracing behaviour in production

SW-662: removed obsolete-unfinished-never-taken-into-production LAPS project, also on this branch to make merging to trunk easier

SW-507: initial skeleton implementation of the tbbservice + the rpc client + the needed start_datawriters_and_wait_until_finished method + a helper/test bin script tbb_start_datawriters

SW-402: merged ltastorageoverview from trunk into LOFAR-Release-3_1 for deployment to production as per request by SOS/SDOS

Task #11560: Added variant file for GNU compiler that sets standard to c++98 explicitly. Removed this setting from the 'default' GNU variant file.

Since it sets -std=c++98, it won't use the new C++11 ABI anyway. 
More important though, it breaks compilation with GCC-5, because several
header files simply check if _GLIBCXX_USE_CXX11_ABI is defined or not.