COMP: ITK_VERSION_XXX cmake varsare useless in OTBConfig : they are not set since the vars are local to Utilities/ITK

COMP: missing flavor of KML, TinyXML and MuParser version in OTBConfig. also added an entry for the Cmake modules dir

COMP: fix #531 : internal FLTK defines only FLTK_INCLUDE_DIRS, while FindFLTK defines FLTK_INCLUDE_DIR

ENH: during the configuration step change Cmake message level from WARNING to STATUS when we deactivated some tests