force world redraw on window resize.

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6445 8aca7d54-2c30-db11-9de9-000461428c89
FIX: map borders on DOUBLE_GROUNDS

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6446 8aca7d54-2c30-db11-9de9-000461428c89
missing newlines

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6447 8aca7d54-2c30-db11-9de9-000461428c89