Fix ValueError in oct2py calls

[AsriFox]

When calling Octave functions through oct2py, by default only the first output value (ans) is returned. To return more than one value, the nout optional argument must be set, e.g. nout=3 for a 3-element tuple.

These changes should allow unit tests to pass.

[AsriFox]

Fixes this for newer versions of oct2py