Parse and compare numpy version strings. Numpy has the following versioning scheme (numbers given are examples; they can be >9) in principle): - Released version: '1.8.0', '1.8.1', etc. - Alpha: '1.8.0a1', '1.8.0a2', etc. - Beta: '1.8.0b1', '1.8.0b2', etc. - Release candida
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