Fix movability flags for pow that straddles zero - #146
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If
xstraddles zero and you dopow(x, y), then we splitxinto a positive and negative half, computepowseparately on each, and union the results. But the issue is that the union preserves movability, whereas in fact refiningxcan result in a smaller interval that no longer straddles zero and thus doesn't do pow on positive or negative at all. The fix is simple: mobilize the interval after the union.