Evaluation operator does not work with ArraySpaces

[eprovst]

I am working with vector valued functions, R -> R^n, and would like to use the Evaluation operator.

If we have f = Fun(x -> [1, 2]) we get the following problems:

• Evaluation(0.5)*f gives an error as the implementation tries to call zero(Vector{Float64}), which is undefined;
• Evaluation in endpoints, Evaluation(-1)*f and Evaluation(1)*f still give the same error as before;
• rangespace(Evaluation(space(f), 0.) returns ConstantSpace(Point(0.)) instead of ArraySpace(ConstantSpace(Point(0.)), 2); and
• Composition with finite operators: FiniteOperator([1. 2.; 3., 4.]) * Evaluation(space(f), 0.) errors.

[eprovst]

Thanks for the fix, however some things seem to still be broken, see the issue description.