support surfaces of revolution with 6 arguments

[gonuke]

Now that GQ's are supported this is probably possible

[pshriwise]

Some GQs are supported, yes... A workflow was proposed to more fully support other GQ types and simplify them for some gray areas created by the numerical tolerances used when performing the linear algebra for characterization and coefficient determination, but this has not yet been implemented. Right now only a few types are supported. (He says at risk of adding a task to his list this week...)