Introduce plan_transform

[dlfivefifty]

No description provided.

[dlfivefifty]

@jagot any thoughts? This is to clean up the notion of transform. That is, we factorization of a quasimatrix now reduces to plan_transform.

It should also support multi-dimensional transforms a la plan_fft.

[codecov]

Codecov Report

Base: 91.47% // Head: 91.71% // Increases project coverage by +0.24% 🎉

Coverage data is based on head (56ba08b) compared to base (21561bc).
Patch coverage: 93.87% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
+ Coverage   91.47%   91.71%   +0.24%     
==========================================
  Files           7        8       +1     
  Lines         610      640      +30     
==========================================
+ Hits          558      587      +29     
- Misses         52       53       +1     

Impacted Files	Coverage Δ
src/bases/basisconcat.jl	98.03% <ø> (ø)
src/bases/basiskron.jl	0.00% <0.00%> (ø)
src/bases/splines.jl	96.51% <ø> (ø)
src/bases/bases.jl	92.21% <95.55%> (+0.68%)	⬆️
src/ContinuumArrays.jl	88.57% <100.00%> (+0.69%)	⬆️
src/operators.jl	76.78% <100.00%> (+0.42%)	⬆️

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[dlfivefifty]

@MikaelSlevinsky

[jagot]

Without understanding everything in detail, I think it looks fine. I don't really use the internals, and It seems the interface stays the same? With expand and transform as added convenience wrappers.

[dlfivefifty]

Yes that is correct.

I'm still not sure about the name Diff. In LazyArrays.jl I'm exporting something else called Diff which is a lazy version of diff(A; dims=d).... but that isn't actually used anywhere....

[dlfivefifty]

I decided to leave it Derivative for now (need to remove Diff from LazyArrays.jl first)