Pyvcf3

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* Include missing .pyx files

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* better walk together record ordering (Thanks datagram, 141)

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* Better contig handling (115, 116, 119 thanks Martijn)
* INFO lines with type character (120, 121 thanks AndrewUzilov, Martijn)
* Single breakends fix (126 thanks pkrushe)
* Speedup by losing ordering of INFO (128 thanks Martijn)
* HOMSEQ and other missing fields in INFO (130 thanks Martijn)
* Add aaf property, (thanks mgymrek 131)
* Custom equality for walk_together, thanks bow 132
* Change default line encoding to '\n'
* Improved __eq__ (134, thanks bow)

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* Handle INFO fields with multiple values, thanks
* Support writing records without GT data 88, thanks bow
* Pickleable call data 112, thanks superbobry
* Write files without FORMAT 95 thanks Martijn
* Strict whitespace mode, thanks Martijn, Lee Lichtenstein and Manawsi Gupta
* Add support for contigs in header, thanks gcnh and Martijn
* Fix GATK header parsing, thanks alimanfoo

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* cython port of 79
* correct writing of meta lines 84

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* issues 78, 79 (thanks Sean, Brad)