No mb fastforward

[katiebreivik]

This is a quite old PR that I'm bringing forward now finally! The change is just to allow for magnetic braking to be turned off through the htmb flag.

[codecov[bot]]

Codecov Report

Attention: 341 lines in your changes are missing coverage. Please review.

Comparison is base (8772c07) 86.91% compared to head (0309ff1) 87.65%. Report is 24 commits behind head on develop.

Files	Patch %	Lines
cosmic/src/assign_remnant.f	9.39%	193 Missing :warning:
cosmic/src/zfuncs.f	6.67%	84 Missing :warning:
cosmic/src/mlwind.f	4.76%	20 Missing :warning:
cosmic/src/hrdiag_remnant.f	64.00%	18 Missing :warning:
cosmic/plotting.py	0.00%	13 Missing :warning:
cosmic/src/evolv2.f	37.50%	5 Missing :warning:
cosmic/checkstate.py	25.00%	3 Missing :warning:
cosmic/src/checkstate.f	0.00%	3 Missing :warning:
cosmic/evolve.py	0.00%	1 Missing :warning:
cosmic/utils.py	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #612 +/- ## =========================================== + Coverage 86.91% 87.65% +0.75% =========================================== Files 40 42 +2 Lines 25542 25723 +181 =========================================== + Hits 22198 22547 +349 + Misses 3344 3176 -168 ```

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[katiebreivik]

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