Don't dispatch on leftendpoint/rightendpoint in Evaluation

[jishnub]

After this,

julia> bvp(Chebyshev())
2-element Vector{ApproxFunBase.ConcreteEvaluation{Chebyshev{ChebyshevInterval{Float64}, Float64}, ApproxFunBase.Boundary, Int64, Float64}}:
 ConcreteEvaluation : Chebyshev() → ConstantSpace(Point(-1.0))
 ConcreteEvaluation : Chebyshev() → ConstantSpace(Point(1.0))

where the eltype is concrete.

[codecov]

Codecov Report

Patch coverage: 86.04% and project coverage change: +0.54 🎉

Comparison is base (69c583a) 69.14% compared to head (bd9b9a2) 69.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
+ Coverage   69.14%   69.68%   +0.54%     
==========================================
  Files          28       28              
  Lines        2573     2619      +46     
==========================================
+ Hits         1779     1825      +46     
  Misses        794      794              

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	81.48% <ø> (ø)
src/Spaces/Jacobi/jacobitransform.jl	100.00% <ø> (ø)
src/Spaces/Ultraspherical/DirichletSpace.jl	50.45% <37.93%> (+0.45%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	59.85% <100.00%> (ø)
src/Spaces/Chebyshev/ChebyshevOperators.jl	87.14% <100.00%> (+0.28%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	66.66% <100.00%> (+0.32%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	83.50% <100.00%> (-0.18%)	⬇️
src/Spaces/PolynomialSpace.jl	92.76% <100.00%> (+0.81%)	⬆️
src/Spaces/Spaces.jl	100.00% <100.00%> (ø)
src/Spaces/Ultraspherical/Ultraspherical.jl	93.10% <100.00%> (+2.03%)	⬆️
... and 1 more

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