Get rid of RealVector, views, test Zygote.

[tpapp]

• make transform_with and index_at! do the index counting,

• generalize RealVector to AbstractVector

TODO

• [ ] wait for a new release of Zygote that contains https://github.com/FluxML/Zygote.jl/pull/297,

• [ ] figure out why inference breaks with Zygote, does it come from LogDensityProblems or TransformVariables?

• [x] make AD test transformation include all transformation types

[codecov[bot]]

Codecov Report

Merging #52 into master will increase coverage by 0.1%. The diff coverage is 97.5%.

@@            Coverage Diff            @@
##           master      #52     +/-   ##
=========================================
+ Coverage   91.35%   91.46%   +0.1%     
=========================================
  Files           6        6             
  Lines         162      164      +2     
=========================================
+ Hits          148      150      +2     
  Misses         14       14

Impacted Files	Coverage Δ
src/utilities.jl	100% <ø> (ø)	:arrow_up:
src/scalar.jl	83.78% <100%> (+0.45%)	:arrow_up:
src/custom.jl	82.35% <100%> (+1.1%)	:arrow_up:
src/aggregation.jl	95.65% <100%> (-0.43%)	:arrow_down:
src/generic.jl	94.44% <100%> (+2.77%)	:arrow_up:
src/special_arrays.jl	93.93% <83.33%> (ø)	:arrow_up:

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