Confusing use of ShouldSchedule flag

[jakthra]

The downlink and uplink scheduler logic requires the .Mac.ShouldSchedule flag. This is confusing when calling the Monster.scheduleUL() function as this does nothing unless the ShouldSchedule flag is set.

I propose the function scheduleUL/scheduleDL is to be independent from the flag, and thus not called if the flag is set to 0.

[MonsterMarkus]

As per the latest commit the check is now moved outside schedule functions in the EvolvedNodeB class and is moved to the monster.m simulation instead. The check is now done with a for loop.

[MonsterMarkus]

Changed the solution to include a warning, thus preventing calling the function without setting the proper flag outside the simulation.