Taxcalc

- Revise code to use smaller puf.csv input file and make changes to create that input file
- Remove debugging variables from functions.py reducing execution time by 42 percent [833]
- Add comments to show one way to use Python debugger to trace Tax-Calculator code [835]
- Add tests that confirm zeroing-out CALCULATED_VARS at start leaves results unchanged [837]
- Make 2013-2016 medical deduction threshold for elderly be 7.5% of AGI (not 10%) [839]
- Fix typo so that two ways of limiting itemized deductions produce the same results [842]
- Revise logic used to estimate behavioral responses to policy reforms [846, 854, 857]

- Add --exact option to simtax.py and inctax.py scripts
- Fix itemized deduction logic for charity
- Remove puf variable from functions.py code
- Add calculation of Schedule R credit
- Remove _cmp variable from functions.py code
- Remove Numba dependency

- Test TaxBrain handling of delayed reforms
- Move cmbtp calculation and earnings splitting logic from Records class to puf.csv file preparation
- Revise Behavior class logic
- Add unit tests to increase code coverage to 98 percent.
- Create Consumption class used to compute "effective" marginal tax rates
- Update Numpy and Pandas dependencies to latest versions to avoid a bug in the Windows conda package for Pandas 0.16.2, see this issue.
- Add scripts to version and release.

- Add --records option to simtax.py
- Add --csvdump option to inctax.py
- Add three d samples to Tax-Calculator versus Internet-TAXSIM comparisons
- Add first set of Tax-Calculator versus TaxBrain comparisons
- Document first set of Tax-Calculator versus taxcalc.sas comparisons
- Add data and logic to implement EITC age-eligibility rules
- Fix Child Care Expense logic
- Exclude dependents from EITC eligibility
- Update and fix 10_minutes_to_Tax-Calculator.ipynb
- Update files in taxcalc/comparison