SRV Election Calculator doesn't recognize ties

[mdempsky]

There are two scenarios that the SRV Election Calculator currently doesn't appear to handle correctly:

1. Three or more candidates tie for first place in scoring, or two or more candidates tie for second place.
2. The top two candidates are equally preferred among voters.

As far as I can tell, these scenarios should be handled as a tie. However, the calculator will instead assign a winner, influenced arbitrarily by the ordering of candidates.