update installer sources for pak128 2.3.0 release

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6403 8aca7d54-2c30-db11-9de9-000461428c89
CODE simplification in export of besch-classes

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6404 8aca7d54-2c30-db11-9de9-000461428c89
size of pak128

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6405 8aca7d54-2c30-db11-9de9-000461428c89