Kshedden sas7bdat perf#1

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jreback:kshedden-sas7bdat_perf

Commits on Apr 17, 2016

Modest performance, address #12647

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Add test data set from raderaj

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Use encoding when reading column headers

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More cython for performance, refactored constants

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Move more code to cython

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Decouple data decoding and decoding e.g. of column names

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Add two missing alignment constants

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Working on cython issues

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Working on cython issues

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Further cythonization

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Added option to not decode header text

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added to whatsnew

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Further encoding work

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pep8 cleanup

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Commits on Apr 18, 2016

PERF: some cython opts
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