The 'help' target is also PHONY
Removed unnecessary code in Makefile
Removing the \T shortcut

it was never being used
Removing the CourseDates macro; it wasn't being used
Correcting minor LaTeX issues

E.g.
 - putting leading zeros before decimal points
 - adding % after an opening curly brace to avoid possibly unwanted space
Updating copyright info in class file

The class has diverged so far from that of Mark's (which was originally just
a set of settings) that making the comment here about from whom it was
hacked is no longer really relevant.
Removing irrelevant font changes
Consolidating the packages used in the class