big: Improvements to Rat.SetString
* Allow an exponent part. This is necessary for exp/eval. * Fix a bug for input that had no numbers after the decimal. * In Int.SetString, allow a leading + sign. * In Int.SetString, error if the input is "-" with no number. * In nat.scan, normalize the resulting nat. R=gri CC=golang-dev https://golang.org/cl/1733045
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