Estimate feature strengths

[alexmaragko]

This PR should replace #141.

Differences with #141:

• New separate module feature_strengths.py now called to calculate PAH feature and emission line strengths.
• Profile-weighted uncertainties removed, but output table uncertainty entry kept (empty) as placeholder for future implementation.
• New argument in run_pahfit (--strength_calc) which will enable feature strength calculation when provided.

[codecov-commenter]

Codecov Report

Merging #151 (52db8bd) into master (e576207) will decrease coverage by 0.82%. The diff coverage is 43.75%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   62.65%   61.83%   -0.83%     
==========================================
  Files           7        8       +1     
  Lines         399      414      +15     
==========================================
+ Hits          250      256       +6     
- Misses        149      158       +9     

Impacted Files	Coverage Δ
pahfit/base.py	57.07% <42.85%> (-0.75%)	:arrow_down:
pahfit/feature_strengths.py	44.44% <44.44%> (ø)

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[alexmaragko]

Feature strengths are now calculated by default. No argument required. Not sure why "link_test" canceled in the checks.

[karllark]

Re-running the checks. Sometimes they fail just because. ;-)

[karllark]

@alexmaragko: is this PR ready for merging in your view? Have you responded to all the comments?

[alexmaragko]

@alexmaragko: is this PR ready for merging in your view? Have you responded to all the comments?

@karllark Yes I believe so.

[karllark]

Thanks for the response. There are multiple approvals so will merge.