fix #144: bug in rational powers of -1 #170
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The previous code seemed to be assuming that the rational exponent a/b satisfied 0 <= a < 2*b, but of course this does not have to be true. I also removed the code that separated the 0 <= a <= b and b < a < 2b cases because I didn't see the reason for the difference. The output seems to always be the desired outcome with this new simplified code.