Add checkTies method

This method ensures that all ties are represented correctly.
Specifically, it ensures that the proper amount of places are skipped if
a prior place is tied.
Document checkTies
Add and document checkStructureSame

This method is anticipated to be used to check that two arrays represent
the same pattern of ties--specifically for pairs of arrays like
EventResults.indivHonorees and EventResults.indivSchools. It wouldn't
make sense for indivHonorees to show no ties while indivSchools shows a
three-way tie for second place.