[CMake][CPack] Set some basic CPack wariables for tarballs.

Tarballs can be built using "make package_source". But they contain
all files from the source directory. There is a way to ignore files.

cmake/modules/DuneMacros.cmake

@@ -329,6 +329,11 @@ macro(dune_module_information MODULE_DIR)
   set(${DUNE_MOD_NAME_UPPERCASE}_VERSION_MAJOR    "${DUNE_VERSION_MAJOR}")
   set(${DUNE_MOD_NAME_UPPERCASE}_VERSION_MINOR    "${DUNE_VERSION_MINOR}")
   set(${DUNE_MOD_NAME_UPPERCASE}_VERSION_REVISION "${DUNE_VERSION_REVISION}")
+
+  # configure CPack
+  set(CPACK_PACKAGE_NAME "${DUNE_MOD_NAME}")
+  set(CPACK_PACKAGE_VERSION "${DUNE_VERSION_MAJOR}.${DUNE_VERSION_MINOR}.${DUNE_VERSION_REVISION}")
+  set(CPACK_SOURCE_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
 endmacro(dune_module_information)
 
 macro(dune_process_dependency_leafs modules versions is_required next_level_deps