- Revert the CMake change regarding the in-source builds for now
    - %%cmake macro covers the %%{set_build_flags}, so they are not needed
      That also means, the debug buildchnages to the build flags must be done AFTER the
      %%cmake macro was used.
    - %%cmake macro also covers the CMAKE_INSTALL_PREFIX="%%{_prefix}" option
    - Default to %%cmake commands instead fo %%make commands
    - Update the WITH_UNITTEST macro to the one upstream use now
    - Introduce macro to enable / disable testusite (and building of the *-test subpackage)