correct bug compare 2 periods, make sure the newest layer is always on top

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3701 e100092c-b5e6-494f-8bdf-19c1ff2a4001
fix timeseries waiting message opacity

git-svn-id: https://svn.bgdi.admin.ch/mf-chsdi/trunk/chsdi@3702 e100092c-b5e6-494f-8bdf-19c1ff2a4001