Sort trains list by departure date

[nalvarez508]

I thought this was done by default, however, it was not.
This could be done in the Train class using the departure datetimes. When the train elements are returned, maybe sort it in the receiving area, in trainResultsArea?
Would need to create a less than __lt__ and greater than __gt__ overload.

[nalvarez508]

On second thought, sorting by duration is actually more useful, I think. Spending less time on the train is valuable.