Remove self-employment tax from income tax total

[martinholmer]

Before this pull request the self-employment tax was incorrectly included in both the payroll tax total and the income tax total. This pull request removes the self-employment tax from the income tax total, leaving it in the payroll tax total. As a result of this bug fix, aggregate income tax revenue for 2013 declines by about $44.7 billion, which is a decline of about 3.6 percent. And there are also changes in the marginal tax rate histograms for the e00200p and e00900p variables.

@MattHJensen @feenberg @Amy-Xu @GoFroggyRun @andersonfrailey @codykallen @talumbau

[codecov-io]

Current coverage is 98.21% (diff: 100%)

Merging #1021 into master will not change coverage

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[martinholmer]

If there are no concerns about pull request #1021, it will be merged at end of the Nov 1st workday.

@MattHJensen @feenberg @Amy-Xu @GoFroggyRun @andersonfrailey @codykallen @talumbau

[MattHJensen]

Thanks a lot for catching this @martinholmer.