New ppp.py

[Peter-Metz]

This PR creates a new ppp.py file. Tax-Calculator's adoption of Paramtools for parameter processing necessitated a new ppp.py script due to changes in the way parameters are defined. The functionality is similar. Moving forward, ppp.py will need to be run whenever inflation rates are updated in growfactors.csv. Thanks to @hdoupe for helping sort out some Paramtools issues.

Changes to policy_current_law.json and aggregate testing files are due to a small change in the 2026 parameter values for II_em_ps. Previously, II_em_ps was not using the most recent inflation rates for future parameter values. Also, there is some minor shuffling of json keys for the ID switch parameters (cc @hdoupe).

@MattHJensen

[codecov]

Codecov Report

Merging #2466 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2466   +/-   ##
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  Coverage   99.92%   99.92%           
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  Files          13       13           
  Lines        2582     2582           
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  Hits         2580     2580           
  Misses          2        2           

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[MattHJensen]

Thanks @Peter-Metz. This looks good. Merging.

Changes to policy_current_law.json and aggregate testing files are due to a small change in the 2026 parameter values for II_em_ps. Previously, II_em_ps was not using the most recent inflation rates for future parameter values.

This happened because I merged #2402 and #2403 within a day of each other and didn't ensure that the changes to the first made it into the second.