Add AdditiveMapUtils, addNumber, addAllNumbers

I wrote methods to accomplish these tasks in the original
ResultsWizard's sweepstakes logic...figured I'd write them early this
time.
Make Sweepstakes.assignPoints static

No clue why I haven't done that already. Forgetting static on methods
and private on instance fields--those are the two modifiers I'm bad
about.
Add Sweepstakes.linkSweepstakes

I've got a lot of unit tests to write.
Add Sweepstakes.computeSweeps

Now, just need to add delegates from EventResults.

And finish my unit tests. :-/
I should not have to insert <br /> in a <code>...</code> tag
Add EventResults.compute*Sweeps
Add EventResults.computeTotalSweeps

Minus some unit tests (always those unit tests), the sweepstakes logic
of this application is now complete--and, if I do say so myself, in most
elegant fashion.

I guess failing at this in ResultsWizard1 had its benefits (I would
never have made the Fraction class, for instance, if I hadn't learned
from ResultsWizard1 that I need to accomodate rational non-integral
amounts of sweepstakes points--by the time I figured this out, I had
already written all of the sweeps logic of ResultsWizard1 in terms of
ints).

Anyway, I am quite proud of myself.