More levels in classic heightmaps for half height conversion factor 2

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7343 8aca7d54-2c30-db11-9de9-000461428c89
More levels in classic heightmaps for half height conversion factor 2

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7344 8aca7d54-2c30-db11-9de9-000461428c89
FIX: waypoints on taxiways before start fixed too

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7345 8aca7d54-2c30-db11-9de9-000461428c89