Change JIT setting on old games to last value of simuconf.tab

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7380 8aca7d54-2c30-db11-9de9-000461428c89
FIX: gui window list corrupted by schedule window self closing while being closed by close all windows command

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7381 8aca7d54-2c30-db11-9de9-000461428c89
FIX: depots were not recognized for planes

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7382 8aca7d54-2c30-db11-9de9-000461428c89