Fixing some stuff with the welcome message

i didn't like how before, if you put anything other than a 0 or 1, then
the program wouldnt do as you expected.
i now make it more explicit. you have to enter 1 for Aging/Preemption
and anything else will give you no aging/ no preemption.
this is a small change, so if you guys dont like this, im ok if you
reject
changing aging to be explicit as well
adding some comments for utilities

not all of them are done but most of them now.
Update Utilities.cpp
Merge pull request #75 from rsingla92/UIChange

Fixing some stuff with the welcome message