[r8820] A crash when opening station info window with separate_halt_capacities=1

[THLeaderH]

Sorry for a bug report with a little bit older version.

Simutrans crashes when a player opens a station info window. This phenomenon occurs when separate_station_capacities=1.

Thank you.

[DrSuperGood]

Possibly related to the numeric overflow with some sorting modes fixes I made many months ago. I do not recall testing with separate capacities enabled.

I will try to recreate later.

[ceeac]

In debug mode, the code hits the assert in gui_image_t::get_min_size(). Removing the assert does not cause any visible ill effects, however I'm not sure whether this is what was originally intended.

[Dwachs]

thanks for the report, should be fixed in r8840