Fast polynomial evaluation via FixedPolynomials.jl

[tanderson92]

No description provided.

[tanderson92]

Preliminary work towards use of FixedPolynomials.jl. What is incomplete is fixing up the types a bit: S, T, and Float64 in the extension module do not make sense yet.

One choice I made is that for vector PDEs it is the user's responsibility to pack and unpack them for handling by the evaluator.

[tanderson92]

For the evaluation routines, does it make more sense to have input x be of type ::AbstractArray{Vector{S}}, so that arbitrary iterable collections can be handled? Probably, and I think this is useful for our intended application where we may want to index into a collection of Vector{S} points generated on the fly from a ::Quadrature