V3.0.3: getObsAtmo

[jeremyneveu]

• [x] use getObsAtmo if available

[coveralls]

Pull Request Test Coverage Report for Build 7248394356

• 96 of 116 (82.76%) changed or added relevant lines in 11 files are covered.
• 49 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.2%) to 90.45%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spectractor/fit/fit_multispectra.py	27	28	96.43%
spectractor/fit/fit_spectrum.py	13	16	81.25%
spectractor/simulation/atmosphere.py	24	29	82.76%
spectractor/tools.py	2	7	28.57%
spectractor/config.py	6	12	50.0%
<!--	Total:	96	116	82.76%	-->

Files with Coverage Reduction	New Missed Lines	%
spectractor/fit/fit_multispectra.py	1	90.27%
spectractor/extractor/chromaticpsf.py	4	91.56%
spectractor/extractor/spectrum.py	6	92.0%
spectractor/astrometry.py	38	87.94%
<!--	Total:	49		-->

Totals
Change from base Build 7207821764:	-0.2%
Covered Lines:	7586
Relevant Lines:	8387

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💛 - Coveralls