Print to File menu

[liquid]

I'd suggest to move print command from Timetable menu to File menu. IMHO, It's more common to have print command there than anywhere else. It may be worth to implement inside Print command some kind of radio button to choose what to print. Overall, it's good to have Print command anyway.

[Liviu Lalescu]

OK, I'll write your suggestion in the TODO, but I have to tell you that a timetable can be printed only after it was generated.