sqapi: add building_desc_x::get_type, convoy_x::get_distance_traveled_total

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6811 8aca7d54-2c30-db11-9de9-000461428c89
Again call it clip

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6812 8aca7d54-2c30-db11-9de9-000461428c89
FIX: test reading and writing socket, do not lose connection on timeout

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6813 8aca7d54-2c30-db11-9de9-000461428c89