API keyword to turn off scaling F2x in call to fair_scm

[chrisroadmap]

Pull request

Please confirm that this pull request has done the following:

• [ ] Tests added
• [ ] Documentation added (where applicable)
• [ ] Example added (either to an existing notebook or as a new notebook, where applicable)
• [ ] Description in CHANGELOG.rst added

Adding to CHANGELOG.rst

Please add a single line in the changelog notes similar to one of the following:

- (`#XX <http://link-to-pr.com>`_) Added feature which does something
- (`#XX <http://link-to-pr.com>`_) Fixed bug identified in (`#XX <http://link-to-issue.com>`_)

[codecov[bot]]

Codecov Report

Merging #70 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files          36       36           
  Lines        1446     1446           
=======================================
  Hits         1405     1405           
  Misses         41       41

Impacted Files	Coverage Δ
fair/forward.py	85.56% <100%> (ø)	:arrow_up:
fair/forcing/ghg.py	100% <100%> (ø)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7b3a535...b818871. Read the comment docs.