Added CMake script which marks variables as advanced.

The marked variables will not show up by default in ccmake or cmake-gui
Enable them by pressing t or the advanced checkbox.

CMakeLists.txt

@@ -180,3 +180,5 @@ endif() # OGS_BUILD_TESTS
 # The configuration must be called from the source dir and not BaseLib/.
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/BaseLib/BuildInfo.cpp.in"
 	"${CMAKE_CURRENT_BINARY_DIR}/BaseLib/BuildInfo.cpp" @ONLY)
+
+include(scripts/cmake/MarkVariablesAdvanced.cmake)

scripts/cmake/MarkVariablesAdvanced.cmake

+mark_as_advanced(
+	BASH_TOOL_PATH
+	Boost_FOUND
+	Boost_INCLUDE_DIRS
+	Boost_LIBRARIES
+	CATALYST_LIBRARIES
+	CMAKE_INCLUDE_SYSTEM_FLAG_CXX
+	CMAKE_OSX_ARCHITECTURES
+	CMAKE_OSX_DEPLOYMENT_TARGET
+	CMAKE_OSX_SYSROOT
+	CPPCHECK_ROOT_DIR
+	CURL_TOOL_PATH
+	DIFF_TOOL_PATH
+	EIGEN3_FOUND
+	EIGEN_NO_DEBUG
+	GIT_TOOL_PATH
+	GPROF_PATH
+	GREP_TOOL_PATH
+	HOSTNAME
+	libgeotiff_INCLUDE_DIR
+	libgeotiff_LIBRARY
+	METIS_INCLUDE_DIR
+	METIS_LIBRARY
+	MPIRUN_TOOL_PATH
+	NUM_PROCESSORS
+	NUMDIFF_TOOL_PATH
+	ParaView_DIR
+	ProcessorCount_cmd_sysctl
+	REALPATH_TOOL_PATH
+	S3CMD_TOOL_PATH
+	VALGRIND_TOOL_PATH
+	VTK_DIR
+	VTKIO_LIB_FOUND
+	xtiff_INCLUDE_DIR
+	ZIP_TOOL_PATH
+)