from_file: address subtle volume bug

[rkingsbury]

Summary

Solution.from_dict contains logic to ensure that the volume of the Solution that is created is exactly equal to that stored in the dictionary. Small differences can arise in the event that, for example, equilibrate() was called on the original solution and updated the volume. This might result in a slightly final volume than what would be calculated on __init__.

Solution.from_file, which is used by from_preset, did not contain this logic in the case of loading yaml files. For json files, loadfn calls from_dict internally, so the volume adjusting logic was used.

For example, loading the seawater preset prior to this PR resulted in a slight change in volume:

FAILED tests/test_solution.py::test_from_preset[seawater] - AssertionError: assert <Quantity(1.0080611297182314, 'liter')> == <Quantity(1.0080615264452506, 'liter')>

This PR adds the subtle volume correction to from_file (for YAML files) and makes several improvements to the associated unit tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.31%. Comparing base (e29b282) to head (10354e3).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #347   +/-   ##
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  Coverage   86.31%   86.31%           
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  Files          14       14           
  Lines        1856     1856           
  Branches      322      322           
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  Hits         1602     1602           
  Misses        208      208           
  Partials       46       46           

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