reframesegment -- don't undo splits where children have been id'ed by mitosis detectors.
everytime reframesegment runs, it looks for split outcomes where cellid==trackid. that can happen if the split is not tracked. that can also happen if the split was tracked, but then the mitosis detector picked that cell as a child. in that second case, if we undo the split that's bad. so don't.
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