CODE: new functions to do the rescaling with ticks_per_world_month_shift

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6749 8aca7d54-2c30-db11-9de9-000461428c89
FIX: some small stuff with tooltips on the climate tools

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6750 8aca7d54-2c30-db11-9de9-000461428c89
Make sure a newly created line schedule is abgeschlossen

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6751 8aca7d54-2c30-db11-9de9-000461428c89