Fix/rates

[chrisdicaprio]

• input slip rates are now inversion target not raw (target can be different from raw by, e.g. application of slip_factor)
• column names identify if a slip rate is a target or solution

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8fdd9eb) 90.10% compared to head (71100c2) 90.21%.

:exclamation: Current head 71100c2 differs from pull request most recent head 2f0df14. Consider uploading reports for the commit 2f0df14 to get more accurate results

Files	Patch %	Lines
solvis/solvis.py	50.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #23 +/- ## ========================================== + Coverage 90.10% 90.21% +0.11% ========================================== Files 14 14 Lines 768 787 +19 Branches 59 60 +1 ========================================== + Hits 692 710 +18 Misses 68 68 - Partials 8 9 +1 ```

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[chrisbc]

@chrisdicaprio just remember the changelog & bumpversion pls :)