Removed the functions for the creation of orthogonal polynomial families from polynomial.jl and placed them in a new file
Removed the functions related to interpolation from polynomial.jl and placed them in a new file
Removed several functions and placed them in separate files (see src/orthogonal.jl and src/interpolation.jl)
Updated PolyMath.jl to resemble the migration of several functions in polynomial.jl to other new files