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Read SAS7BDAT files

Based on code written by Jared Hobbs:
  https://bitbucket.org/jaredhobbs/sas7bdat

See also:
  https://github.com/BioStatMatt/sas7bdat

Partial documentation of the file format:
  https://cran.r-project.org/package=sas7bdat/vignettes/sas7bdat.pdf

Reference for binary data compression:
  http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/CUJ/1992/9210/ross/ross.htm
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       Dates or datetimes in SAS
    unit : {'d', 's'}
       "d" if the floats represent dates, "s" for datetimes

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    index : column identifier, defaults to None
        Column to use as index.
    convert_dates : bool, defaults to True
        Attempt to convert dates to Pandas datetime values.  Note that
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    blank_missing : bool, defaults to True
        Convert empty strings to missing values (SAS uses blanks to
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    chunksize : int, defaults to None
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    encoding : str, 'infer', defaults to None
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