Add a_lineno variable to cps.csv.gz data file

[martinholmer]

This pull request adds a new variable to the cps.csv.gz data file that is called a_lineno. This variable, which is the CPS A_LINENO for the person who is the taxpayer (head) in the Tax-Calculator filing unit, is not used in the tax calculations but is useful when matching CPS data to Tax-Calculator filing units.

@andersonfrailey prepared this new version of cps.csv.gz in taxdata pull request 152.

The changes in this pull request have no effect on tax-calculating logic or on tax results.

[codecov-io]

Codecov Report

Merging #1885 into master will not change coverage.
The diff coverage is n/a.

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##           master   #1885   +/-   ##
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  Coverage     100%    100%           
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  Files          37      37           
  Lines        3301    3301           
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  Hits         3301    3301

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