Task #9127: update compiler default cmake files: uniformize OPTARCH, add -stdlib=libc++ to CLANG (acked-by Tammo Jan Dijkema)

Task #9350: factored out getPathForOTDBId into seperate class PathResolver in DataManagementCommon, which can be used by other datamanagement service as well, and also provided cmdline client getPathForTask

Task #9533: Oops! The CMake command get_filename_component() only recently supports DIRECTORY; use PATH instead.

Task #9533: Added a CMake macro lofar_add_sysconf_files to install system configuration files that typically need to be installed in <prefix>/etc.

Task #8021: Added check for existing target to lofar_create_target_symlink(). Take two, which is hopefully correct now.

Task #8887: added OTDBtoRATaskStatusPropagator which propagates every otdb task status change to radb except prescheduled, because the taskspecifiedservice takes care of this

Task #9257: renamed ResourceAssignment/Services to ResourceAssignment/RATaskSpecifiedService. Made lofar_package RATaskSpecifiedService. moved files into seperate lib/bin dir

Task #8758: merge from branch RA-Task8758 to trunk. svn merge did not work, so I used svn diff on branch and svn patch to trunk. For revision history, see branch.

Task #9048: Added Docker package. Generate Dockerfiles from templates to build this branch and revision in the Docker image

Task #8887: made skeleton cmake tree, python modules and resourceassigner bin script for resourceassigner

install xmlgen.py script which is both a lib and a bin script in site-packages lofar tree.
made executable script xmlgen (which imports xmlgen.py) for bin dir.
moved regression test data into test_regression.in_data dir, so ctest can copy it automagically.
made minor modifications to tests so they import the proper xmlgen module, and call the proper xmlgen bin script.'