add extend_existing for zementindustrie layers

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3973 e100092c-b5e6-494f-8bdf-19c1ff2a4001
updated treasurehunt datenstand

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3974 e100092c-b5e6-494f-8bdf-19c1ff2a4001
delete property executable

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3975 e100092c-b5e6-494f-8bdf-19c1ff2a4001