Kron for Fun and UniformScaling

[jishnub]

After this,

julia> Fun() ⊗ I
KroneckerOperator : ApproxFunBase.UnsetSpace() ⊗ ApproxFunBase.UnsetSpace() → ApproxFunBase.UnsetSpace() ⊗ ApproxFunBase.UnsetSpace()

The I is promoted to an operator automatically.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.31 🎉

Comparison is base (441f15c) 71.31% compared to head (a302de8) 71.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
+ Coverage   71.31%   71.62%   +0.31%     
==========================================
  Files          81       81              
  Lines        8533     8535       +2     
==========================================
+ Hits         6085     6113      +28     
+ Misses       2448     2422      -26     

Impacted Files	Coverage Δ
src/ApproxFunBase.jl	84.00% <ø> (ø)
src/LinearAlgebra/clenshaw.jl	36.31% <100.00%> (ø)
src/Multivariate/Multivariate.jl	55.93% <100.00%> (+1.54%)	⬆️

... and 12 files with indirect coverage changes

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