FIX: (Philip) calculation of diagonal images

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7325 8aca7d54-2c30-db11-9de9-000461428c89
compile again

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7326 8aca7d54-2c30-db11-9de9-000461428c89
compile fix

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7327 8aca7d54-2c30-db11-9de9-000461428c89