FIX: set starting year/month of scenario before calling start()

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6229 8aca7d54-2c30-db11-9de9-000461428c89
FIX: locations of scenario example files in sqapi doc

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6230 8aca7d54-2c30-db11-9de9-000461428c89