added a special treatment for absorption on BLR if one of the grid points ends up very close to the shell

[jsitarek]

also a test to check that it is working

this should solve problem reported in issue #90

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.41%.

Quality metrics	Before	After	Change
Complexity	0.93 ⭐	0.90 ⭐	-0.03 👍
Method Length	91.56 🙂	92.30 🙂	0.74 👎
Working memory	13.64 😞	13.38 😞	-0.26 👍
Quality	59.51% 🙂	59.92% 🙂	0.41% 👍

Other metrics	Before	After	Change
Lines	1117	1195	78

Changed files	Quality Before	Quality After	Quality Change
agnpy/absorption/absorption.py	65.01% 🙂	63.83% 🙂	-1.18% 👎
agnpy/tests/test_absorption.py	54.06% 🙂	56.41% 🙂	2.35% 👍
agnpy/utils/math.py	59.56% 🙂	59.89% 🙂	0.33% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
agnpy/utils/math.py	trapz_loglog	3 ⭐	238 ⛔	19 ⛔	41.31% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/tests/test_absorption.py	TestAbsorptionMuS.test_tau_dt_mu_s_far	0 ⭐	285 ⛔	18 ⛔	42.88% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/absorption/absorption.py	Absorption.evaluate_tau_ss_disk	0 ⭐	233 ⛔	18 ⛔	45.35% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/tests/test_absorption.py	TestAbsorption.test_absorption_dt_reference_tau	0 ⭐	180 😞	21 ⛔	47.17% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/absorption/absorption.py	Absorption.evaluate_tau_blr_mu_s	1 ⭐	202 😞	17 ⛔	47.27% 😞	Try splitting into smaller methods. Extract out complex expressions

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[codecov]

Codecov Report

Merging #91 (435d853) into master (fd7826f) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   94.36%   94.46%   +0.09%     
==========================================
  Files          30       30              
  Lines        2059     2094      +35     
==========================================
+ Hits         1943     1978      +35     
  Misses        116      116              

Flag	Coverage Δ
unittests	94.46% <100.00%> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
agnpy/absorption/absorption.py	95.40% <100.00%> (+0.17%)	⬆️
agnpy/tests/test_absorption.py	100.00% <100.00%> (ø)
agnpy/utils/math.py	100.00% <100.00%> (ø)

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[cosimoNigro]

Everything looks good.