Cumulative updates

[yalinli2]

Mainly includes:

• Fixes in LCA-related classes.
• Updates (more flexible) in HTL-related classes and CHP.
• FAQ for fixing the underlying object has vanished error.
• Addition of common cost indices.

[codecov]

Codecov Report

Attention: Patch coverage is 88.35616% with 17 lines in your changes missing coverage. Please review.

Project coverage is 73.52%. Comparing base (cb6678a) to head (19486fa).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
qsdsan/_lca.py	73.52%	8 Missing and 1 partial ⚠️
qsdsan/sanunits/_combustion.py	90.24%	3 Missing and 1 partial ⚠️
qsdsan/_sanunit.py	33.33%	0 Missing and 2 partials ⚠️
qsdsan/utils/utilities.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   73.37%   73.52%   +0.14%     
==========================================
  Files          95       96       +1     
  Lines       18950    19045      +95     
  Branches     1662     1668       +6     
==========================================
+ Hits        13904    14002      +98     
+ Misses       4488     4487       -1     
+ Partials      558      556       -2     

Flag	Coverage Δ
unittests	73.52% <88.35%> (+0.14%)	⬆️

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[yalinli2]

@jiananf2

FYI, this will merge in the changes in CHP as I noted here: 5e2d8f0

as well as some other HTL-related changes, but I don't expect that to affect your results, let me know if it's cause trouble tho, thanks!