ADD command-line option -threads to set number of threads

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6860 8aca7d54-2c30-db11-9de9-000461428c89
class instead struct to keep MSVC happy

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6861 8aca7d54-2c30-db11-9de9-000461428c89
Update links for pak192.comic

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6862 8aca7d54-2c30-db11-9de9-000461428c89
Update links for pak192.comic

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6863 8aca7d54-2c30-db11-9de9-000461428c89
reformatting

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6864 8aca7d54-2c30-db11-9de9-000461428c89