Volume node output format

Created by: cromlyngames

Problem statement

Analyzer: Volume node outputs number result in [x] format. This is not compatible with the number node or the area node, both of which output in [[x]]

Steps to reproduce

1. create circle and cylinder of same diamter
2. find area of circle, and volume of cylinder
3. divide (scalar maths) of volume by area fails

Expected result

A number result, the same as the cylinder height

Actual result

"IndexError('Tuple index out of range')

Sverchok version

1.0.0 from sverchok-master.zip from github