Dev: Incremental update

[psalvy]

• Adds logs for cons/var creation
• Fixes some deprecated uses of solution.x_dict (see #28)
• Better tests

[codecov[bot]]

Codecov Report

Merging #29 into master will increase coverage by 0.73%. The diff coverage is 86.79%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   70.06%   70.79%   +0.73%     
==========================================
  Files          44       45       +1     
  Lines        3311     3339      +28     
==========================================
+ Hits         2320     2364      +44     
+ Misses        991      975      -16

Impacted Files	Coverage Δ
pytfa/optim/variables.py	79.32% <0%> (ø)	:arrow_up:
pytfa/analysis/variability.py	25.53% <0%> (+0.26%)	:arrow_up:
setup.py	0% <0%> (ø)	:arrow_up:
pytfa/io/plotting.py	0% <0%> (ø)	:arrow_up:
pytfa/analysis/manipulation.py	64.51% <100%> (+54.83%)	:arrow_up:
tests/settings.py	100% <100%> (ø)	:arrow_up:
pytfa/thermo/utils.py	93.22% <100%> (+0.23%)	:arrow_up:
tests/test_io.py	100% <100%> (ø)	:arrow_up:
pytfa/core/model.py	83.88% <100%> (+0.18%)	:arrow_up:
tests/test_analysis.py	100% <100%> (ø)
... and 4 more

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