Pyvcf3

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* Single floats in Reader._sample_parser not being converted to float 35
* Handle String INFO values when Number=1 in header 34

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* Installation problems

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* Installation problems

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* Package structure
* add ``vcf.utils`` module with ``walk_together`` method
* samtools tests
* support Freebayes' non standard '.' for no call
* fix vcf_melt
* support monomorphic sites, add ``is_monomorphic`` method, handle null QUALs
* filter support for files with monomorphic calls
* Values declared as single are no-longer returned in lists
* several performance improvements

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* Fix setup.py for python < 2.7
* Add ``__eq__`` to ``_Record`` and ``_Call``
* Add ``is_het`` and ``is_variant`` to ``_Call``
* Drop aggressive parse mode: we're always aggressive.
* Add tabix fetch for single calls, fix one->zero based indexing
* add prepend_chr mode for ``Reader`` to add `chr` to CHROM attributes

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Documentation release