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Class ThreadHeap has been created as an instance of GenericHeap.
The ThreadHeap has a default ``key'' of ThreadPriority; this will
make it marginally faster for ...

Class HeapScheduler now uses a ThreadHeap instead of an AwesimeHeap.
This change should not be noticed.

Class EventScheduler now pulls *all* events scheduler to occur at a
specific time. Previously, it pulled a single event, put that in
the subScheduler & continued; this works fine when you're using a
FifoScheduler as the subScheduler, but if you're using a HeapScheduler,
it was possible that threads were not getting executed in priority
order. This is now fixed. A comparison of ~/Awesime/Examples/{ONE,TWO}
should show the difference this makes.
