Experiment class implementing volume checks and tracking.

[cgevans]

This pull request has an Experiment class, which takes a series of mixes, and tracks volumes produced and consumed.

There are some questions that need to be resolved:

• This currently has tracks mixes and components by name. This may be reasonably safe for mixes, but is not safe for components (may be reordered, etc). It would be better have some better reference method, though this may not be immediately necessary.
• The Experiment class uses a list of mixes / components. It may be better to have it use, eg, an ordereddict, keeping track of names. This would also make the Experiment a convenient way to store/refer to mixes.

Partially closes #4, closes #14, partially closes #13.

[codecov-commenter]

Codecov Report

Merging #16 (dfe2273) into main (b9fc5fe) will increase coverage by 4.34%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   68.35%   72.69%   +4.34%     
==========================================
  Files          12       14       +2     
  Lines        1694     1934     +240     
==========================================
+ Hits         1158     1406     +248     
+ Misses        536      528       -8     

Impacted Files	Coverage Δ
src/alhambra_mixes/locations.py	71.91% <ø> (-0.20%)	⬇️
src/alhambra_mixes/quantitate.py	53.97% <0.00%> (ø)
src/alhambra_mixes/util.py	100.00% <ø> (+11.11%)	⬆️
src/alhambra_mixes/dictstructure.py	61.53% <61.53%> (ø)
src/alhambra_mixes/units.py	78.50% <64.28%> (-2.15%)	⬇️
src/alhambra_mixes/actions.py	85.71% <71.18%> (-3.36%)	⬇️
src/alhambra_mixes/components.py	88.77% <89.74%> (+0.57%)	⬆️
src/alhambra_mixes/mixes.py	67.19% <95.00%> (+12.40%)	⬆️
src/alhambra_mixes/__init__.py	100.00% <100.00%> (ø)
src/alhambra_mixes/abbreviated.py	100.00% <100.00%> (ø)
... and 5 more

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