calling (empty) parent constructor, just in case we add something in the future
calling (empty) parent constructor, just in case we add something in the future

git-svn-id: 353be9ac11a1e711854a13efcc2fc17d9d6b83e7@1454 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok