Fixed problems with randomization & cycling, added test procedure in a
main() function, added documentation.
Fixed bug with randomization
Added meaningful toString(); fixed bug with counting potential
inversions.
Fixes to insertAt()
Basic test procedures; not automated unit tests, but those used for
debugging purposes.
Finishing details for OrderedPerson.  Keeping reference to random,
actualization of probabilities for insertion, minor debugging.
Details for the top-level OrderedDiffusion simulation.