static integer orders in Ultraspherical spaces

[jishnub]

After this, the following become type-inferred:

julia> @inferred Conversion(Ultraspherical(static(1)), Ultraspherical(static(4)));

julia> @inferred (() -> Conversion(Ultraspherical(1), Ultraspherical(static(4))))();

Also, generalizes Ultraspherical transforms, so that the following work now:

julia> Fun(x->x^2, NormalizedUltraspherical(3.5))
Fun(NormalizedUltraspherical(3.5), [0.106243, 0.0, 0.128133])

julia> Fun(x->x^2, NormalizedJacobi(3,3))
Fun(NormalizedJacobi(3,3), [0.106243, 0.0, 0.128133])

julia> Fun(x->x^2, NormalizedUltraspherical(3.5)) ≈ Fun(x->x^2)
true

[codecov]

Codecov Report

Base: 60.95% // Head: 67.10% // Increases project coverage by +6.15% 🎉

Coverage data is based on head (d2f3895) compared to base (a94565e).
Patch coverage: 72.41% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
+ Coverage   60.95%   67.10%   +6.15%     
==========================================
  Files          28       28              
  Lines        2492     2508      +16     
==========================================
+ Hits         1519     1683     +164     
+ Misses        973      825     -148     

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	66.66% <ø> (ø)
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	74.21% <57.57%> (-2.17%)	⬇️
src/Spaces/Jacobi/Jacobi.jl	65.04% <75.00%> (+1.94%)	⬆️
src/Spaces/PolynomialSpace.jl	89.31% <85.71%> (+0.59%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	59.85% <100.00%> (+1.70%)	⬆️
src/Spaces/Chebyshev/ChebyshevOperators.jl	86.33% <100.00%> (+0.09%)	⬆️
src/Spaces/Hermite/Hermite.jl	70.88% <100.00%> (+22.16%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	80.14% <100.00%> (+12.34%)	⬆️
src/Spaces/Ultraspherical/ContinuousSpace.jl	54.28% <100.00%> (+3.03%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	81.48% <100.00%> (+3.89%)	⬆️
... and 17 more

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