Code review comment for lp:~widelands-dev/widelands/ai-scheduler

This is not ideal. These due times should be treated as variables - everytime defined; with the queue there is a chance they can be not present in queue, or put into queue multiple times.

Also sorting entire structure is a bit overkill - I just need to find the oldest. No sense to re-sort structure of 15 pairs everytime "scheduler" runs. (Not that would do much harm to CPU)

Dumb pairs seems the best to me. I will at least save one set of variables (all these *_check_due variables)