Zinc python bindings returning scalar for 1 element list

[rchristie]

In the python bindings for certain Zinc APIs which generally return a list of values, there is a special case where a scalar is returned if there is one value.
This is irritating, as it requires turning the scalar into a list to work with the same client code.
Particularly bad example:
Element.getScaleFactors() which returns a list if there are 0 or >1 values, but a scalar if there is 1.
All python APIs which can return a list should return a list, even if one element in it.