Draft module level defaults

[dpole]

Allow for module-level defaults. E.g. to fix the frequencies for all the SED classes you'll create from fgspectra.frequency, now you can do

fgspectra.frequency.defaults = {'nu': np.arange(10)}

[codecov-commenter]

Codecov Report

Merging #35 into master will increase coverage by 3.09%.
The diff coverage is 64.70%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
+ Coverage   64.01%   67.10%   +3.09%     
==========================================
  Files           4        4              
  Lines         289      304      +15     
==========================================
+ Hits          185      204      +19     
+ Misses        104      100       -4     

Impacted Files	Coverage Δ
fgspectra/frequency.py	81.53% <ø> (-0.28%)	⬇️
fgspectra/power.py	61.29% <33.33%> (-2.51%)	⬇️
fgspectra/model.py	83.33% <100.00%> (+33.33%)	⬆️

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[dpole]

I've used this new functionality in test_model.py. As you can see now ell is not specified for every model but once for all at the beginning

fgspectra/tests/test_models.py

Line 12 in aa8ce23

fgp.defaults = {'ell': np.array([2000])}