FIX: many bridgebuilder errors and tries to connect to next tile next to a bridge using wagbauer for error echeck

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6978 8aca7d54-2c30-db11-9de9-000461428c89
FIX: do not leave single sloped way on double slope when deleting bridges

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6979 8aca7d54-2c30-db11-9de9-000461428c89