Use synphot for the magnitude work

[mcoughlin]

Fixes #34 .

[codecov]

Codecov Report

Merging #38 (7846427) into master (44cf9d2) will increase coverage by 0.88%.
The diff coverage is 11.42%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   21.33%   22.21%   +0.88%     
==========================================
  Files          25       25              
  Lines        1608     1508     -100     
==========================================
- Hits          343      335       -8     
+ Misses       1265     1173      -92     

Impacted Files	Coverage Δ
dorado/scheduling/scripts/animate_survey.py	4.66% <0.00%> (ø)
dorado/scheduling/scripts/simsurvey.py	8.81% <0.00%> (+0.63%)	⬆️
dorado/scheduling/scripts/survey_slicer.py	3.72% <0.00%> (ø)
dorado/scheduling/dust.py	29.03% <18.18%> (+13.19%)	⬆️

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