Add person, household data to ACS

[nikhilwoodruff]

Enabling the ACS dataset within OpenFisca-US. Thanks @Kklu78 for the head start on PolicyEngine/openfisca-us-data#57

[codecov]

Codecov Report

Merging #690 (3a24bbb) into master (00e988c) will decrease coverage by 1.87%.
The diff coverage is 48.95%.

@@            Coverage Diff             @@
##           master     #690      +/-   ##
==========================================
- Coverage   94.12%   92.24%   -1.88%     
==========================================
  Files         294      304      +10     
  Lines        5528     5762     +234     
  Branches      574      595      +21     
==========================================
+ Hits         5203     5315     +112     
- Misses        295      416     +121     
- Partials       30       31       +1     

Impacted Files	Coverage Δ
openfisca_us/data/datasets/acs/acs.py	28.33% <28.33%> (ø)
openfisca_us/data/datasets/acs/raw_acs.py	28.76% <28.76%> (ø)
openfisca_us/data/datasets/cps/cps.py	30.76% <33.33%> (+0.12%)	⬆️
...s/variables/income/spm_unit/spm_unit_net_income.py	90.47% <33.33%> (-9.53%)	⬇️
..._us/variables/demographic/person/vehicles_owned.py	48.00% <48.00%> (ø)
..._us/variables/demographic/weights/person_weight.py	87.50% <50.00%> (-12.50%)	⬇️
...s/variables/demographic/weights/spm_unit_weight.py	87.50% <50.00%> (-12.50%)	⬇️
...income/spm_unit/spm_unit_is_in_deep_spm_poverty.py	70.00% <70.00%> (ø)
...es/contrib/ubi_center/basic_income/basic_income.py	75.00% <75.00%> (ø)
...isca_us/variables/income/spm_unit/spm_unit_fips.py	87.50% <87.50%> (ø)
... and 10 more

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