function.eval() needs to accept a 1d numpy array

[ofloveandhate]

i shouldn't have to unpack my numpy points to eval. fix this.

[ofloveandhate]

i should also be able to eval from an unpacked dict of values

[ofloveandhate]

Addressed in #305 — node.eval now accepts a 1-D point (array/list, mapped to variables() order, override with variables=) or a {Variable-or-name: value} dict, in addition to the kwargs form; still returns complex_mp natively.