UBI and `alpha_I` parameter updates

[jdebacker]

This PR does the following:

1. Updates the range for the nominal UBI parameters. These were not well defined for using nominal values in different currencies. Also, negative values may be useful if one wanted to simulate a head tax.
2. Adds a description of the $\alpha_I$ parameter
3. Updates parameters.py to extrapolate the alpha_I parameter
4. Ensures that alpha_I dimensions conform in time path calculations of I_g

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.08%. Comparing base (e120ea6) to head (f96b391). Report is 10 commits behind head on master.

Files	Patch %	Lines
ogcore/TPI.py	0.00%	2 Missing :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels) ```diff @@ Coverage Diff @@ ## master #966 +/- ## ======================================= Coverage 71.08% 71.08% ======================================= Files 20 20 Lines 4977 4977 ======================================= Hits 3538 3538 Misses 1439 1439 ``` | [Flag](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels) | `71.08% <33.33%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels) | Coverage Δ | | |---|---|---| | [ogcore/\_\_init\_\_.py](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966?src=pr&el=tree&filepath=ogcore%2F__init__.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels#diff-b2djb3JlL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [ogcore/parameters.py](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966?src=pr&el=tree&filepath=ogcore%2Fparameters.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels#diff-b2djb3JlL3BhcmFtZXRlcnMucHk=) | `82.91% <ø> (ø)` | | | [ogcore/TPI.py](https://app.codecov.io/gh/PSLmodels/OG-Core/pull/966?src=pr&el=tree&filepath=ogcore%2FTPI.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PSLmodels#diff-b2djb3JlL1RQSS5weQ==) | `35.82% <0.00%> (ø)` | |

[jdebacker]

@rickecon This PR is ready to review.

[rickecon]

@jdebacker. You will want to update this branch with the main branch as the current version is 0.11.16. So you should update this version to 0.11.17.

[rickecon]

@jdebacker. This is ready to merge as soon as you update the versions (and update your branch with the main).

[jdebacker]

@rickecon Thanks for noting the more recent version. I synced to master and bumped the version numbers. Let me know if this looks good to you. If so, it's ready to merge.

[rickecon]

@jdebacker. There are still some issues with the version number in CHANGELOG.md, setup.py, and __init__.py. Give me a call today if you want to talk through those.

[jdebacker]

@rickecon I think I missed committing some changes before. I've now done that and fixed a couple typos. Let me know if we need anything else here.

[rickecon]

@jdebacker. Looks great. Merging now.