ResTriangleCheck(). By using hash tables, I reduced
ResParallelCheck() from O(N^2) to O(N), and I reduced
ResTriangleCheck() from O(N^3) to O(N^2); however, it is a bit
better than that because previously there was an N^2 loop over
items in the same list, so if one list happened to be very long,
then N^2 would be huge; whereas now the N^2 is the length of two
lists multiplied together, where both lists would have to be very
long to have the same performance impact. It appears that long
resistor lists are pathological and rare. For an example
pathological case, the extresist runtime has been reduced from
hours to seconds.
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