Add parameter for minimum consumption amounts

[jdebacker]

This PR adds a new parameter, c_min that represents the minimum consumption amounts for each i consumption good. This parameter was already outlined in the theory, but hadn't bee included in the model code.

Resolves Issue #982.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.19%. Comparing base (83227e3) to head (bd51688).

Files with missing lines	Patch %	Lines
ogcore/txfunc.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
+ Coverage   72.92%   73.19%   +0.27%     
==========================================
  Files          21       21              
  Lines        5122     5137      +15     
==========================================
+ Hits         3735     3760      +25     
+ Misses       1387     1377      -10     

Flag	Coverage Δ
unittests	73.19% <96.96%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
ogcore/SS.py	81.01% <100.00%> (ø)
ogcore/TPI.py	33.63% <100.00%> (+0.15%)	⬆️
ogcore/household.py	92.71% <100.00%> (+4.72%)	⬆️
ogcore/txfunc.py	46.41% <0.00%> (ø)

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[jdebacker]

All tests, but one, pass locally:

tests/test_SS.py .........................................               [100%]
tests/test_TPI.py ............................                           [100%]
tests/test_aggregates.py .........................................       [100%]
tests/test_basic.py ....                                                 [100%]
tests/test_demographics.py ................                              [100%]
tests/test_elliptical_u_est.py .......                                   [100%]
tests/test_execute.py .                                                  [100%]
tests/test_firm.py ..................................................... [ 76%]
................                                                         [100%]
tests/test_fiscal.py ......................                              [100%]
tests/test_household.py ................................................ [ 96%]
..                                                                       [100%]
tests/test_output_plots.py ............................................. [ 95%]
..                                                                       [100%]
tests/test_output_tables.py ..............                               [100%]
tests/test_parameter_plots.py ........................................   [100%]
tests/test_parameter_tables.py .......                                   [100%]
tests/test_parameters.py ..............                                  [100%]
tests/test_pensions.py .................................                 [100%]
tests/test_run_example.py ..                                             [100%]
tests/test_run_ogcore.py .                                               [100%]
tests/test_tax.py ...................................                    [100%]
tests/test_txfunc.py ............................F.                      [100%]  
tests/test_user_inputs.py .........                                      [100%]
tests/test_utils.py .................................................... [ 62%]
...............................                                          [100%]

The failing test is tests/test_txfunc.py::test_tax_func_estimate. The failure is related to dask:

E                       distributed.scheduler.KilledWorker: Attempted to run task 'tax_func_loop-981021c9-2caf-46b5-8809-bf3df83cd5db' on 4 different workers, but all those workers died while running it. The last worker that attempt to run the task was tcp://127.0.0.1:51937. Inspecting worker logs is often a good next step to diagnose what went wrong. For more information see https://distributed.dask.org/en/stable/killed.html.

[jdebacker]

@rickecon, despite the failing test, this PR is ready for your review. Perhaps you can try the failing test on your machine. I don't recall that failing before, but it's odd since nothing was changed related to the function tested.

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