More Unitful support

[LebedevRI]

As noted in #151,
the functionality provided in utils.jl does not support Unitful Measuremets.

I'm not 100% sure about the unit handling in derivative.

I don't think uncertainty_components can properly support units,
since derivatives only track Measuremets, after stripping AbstractQuantity...

TODO: cov/cor/correlated_values.

[codecov]

Codecov Report

Merging #152 (3520aec) into master (c12fb10) will decrease coverage by 0.16%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 3520aec differs from pull request most recent head 10d7506. Consider uploading reports for the commit 10d7506 to get more accurate results

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   96.91%   96.76%   -0.16%     
==========================================
  Files           9        9              
  Lines         616      618       +2     
==========================================
+ Hits          597      598       +1     
- Misses         19       20       +1     

Files Changed	Coverage Δ
src/utils.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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