sqapi: FIX exporting of map objects

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7078 8aca7d54-2c30-db11-9de9-000461428c89
FIX: load compatibility scripts also when loading a savegame

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7079 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: provide means to iterate through global list of convoys as well as convoys stopping at a particular halt

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7080 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: export lines

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7081 8aca7d54-2c30-db11-9de9-000461428c89