Fixed problems referenced by minor todos and removed the todos.

[Rlamboll]

Pull request

Please confirm that this pull request has done the following:

• Tests added (none needed)
• Documentation added (where applicable) (none)
• 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 <https://github.com/znicholls/silicone/pull/XX>`_) Added feature which does something
- (`#XX <https://github.com/znicholls/silicone/pull/XX>`_) Fixed bug identified in (`#YY <https://github.com/znicholls/silicone/issues/YY>`_)

[znicholls]

lgtm

[codecov]

Codecov Report

Merging #62 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #62   +/-   ##
=======================================
  Coverage   98.22%   98.22%           
=======================================
  Files          18       18           
  Lines         788      788           
  Branches      166      166           
=======================================
  Hits          774      774           
  Misses          8        8           
  Partials        6        6           

Impacted Files	Coverage Δ
src/silicone/utils.py	100.00% <ø> (ø)
src/silicone/database_crunchers/rms_closest.py	100.00% <100.00%> (ø)
...llers/infill_all_required_emissions_for_openscm.py	90.52% <100.00%> (ø)

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