Single term for returns/filers in tables

[MaxGhenis]

Minor suggestion to make table headers more consistent: returns or filers are currently denoted as a mix of Returns Filers Count and Itemizers. I think a single term would be clearer (my vote would be Filers).

Distribution table:

• Returns
• Standard Deduction Filers
• Itemizers (could be e.g. Itemized filers)
• AMT Filers

Differences table:

• Returns
• Count with Tax Cut
• Count with Tax Increase

[andersonfrailey]

Thanks for the suggestion, @MaxGhenis. Tax-Brain uses the table headers specified in Tax-Calculator so I'm going to open this as an issue that repo.