Fix memory-one error in compute FSM memory #1243
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In using, I uncovered a bug. Basically memory-zero and memory-one cases need to be handled specially. I was checking this case with a condition on the number of memit-pairs, but in fact a memory-one strategy could have a long chain memit-pairs that all suggest the same set of reactions.
So I fixed this, and added a test that would have caught this error.
I created a copy of #1242, because I'm bad at git.