(MCollett) compile with clang

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6413 8aca7d54-2c30-db11-9de9-000461428c89
CODE: remove cast on ignored return value

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6414 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: add methods to handle directions (ribi)

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6415 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: add get_neighbour

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6416 8aca7d54-2c30-db11-9de9-000461428c89