Automatic inverse link

[palday]

• adds a way to create extensions for automatic inverse link determination
• defines such extensions for GLM and MixedModels
• this also allows using analytic deritvatives instead of AD for the difference method

[codecov[bot]]

Codecov Report

Merging #56 (e838625) into main (1cd621d) will decrease coverage by 0.58%. The diff coverage is 95.65%.

@@             Coverage Diff             @@
##              main      #56      +/-   ##
===========================================
- Coverage   100.00%   99.42%   -0.58%     
===========================================
  Files            4        6       +2     
  Lines          154      174      +20     
===========================================
+ Hits           154      173      +19     
- Misses           0        1       +1     

Files Changed	Coverage Δ
src/Effects.jl	100.00% <ø> (ø)
src/regressionmodel.jl	97.77% <94.44%> (-2.23%)	:arrow_down:
ext/EffectsGLMExt.jl	100.00% <100.00%> (ø)
ext/EffectsMixedModelsExt.jl	100.00% <100.00%> (ø)

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