squelch annoying compiler warning

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7021 8aca7d54-2c30-db11-9de9-000461428c89
FIX undefined assignment

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7022 8aca7d54-2c30-db11-9de9-000461428c89
FIX crash - revert change on MAX_FAB_GOODS_STAT

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7023 8aca7d54-2c30-db11-9de9-000461428c89
More optimisation of factory chain building

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7024 8aca7d54-2c30-db11-9de9-000461428c89