Add "tolerance parameter" in the command shell

The “shell” tool is often dependent on the tolerance parameter (sometimes you need to increase the value for the emptying operation to work well), why not add a “tolerance” option to the command? (It would be avoided every time to enter in the panel options Rhino’s).

Hi Davide - please check the edge tolerances and vertex tolerances (in the `What`` command) after shelling at a loose tolerance - are they larger than the initial tolerance? If so, that would indicate this is a bad way to work…