Shotcut addition

[Cyrus Ireri]

I'm used to using a set of activities occupies max/min set of time slots from selection.If we can have a keyboard shotcut for ALL, CLEAR and SELECTING NEXT GROUP,it would be gteat.It would make work easier when one has to have constraint for alm subjects in all groups.Never easy for  28 subjects and 30 groups.Moving from one group to another is hectic

[Liviu Lalescu]

Cyrus, I'll add this in the TODO.

[Cyrus Ireri]

Nice.Thank you