Automated tests are not run for VisualWorks

[Rinzwind]

The automated tests are currently not run for VisualWorks. I'm not sure whether Parasol still works on VisualWorks or not. I'm not aware of anyone actively using Parasol on VisualWorks.

I don't think smalltalkCI has support for VisualWorks.

Perhaps we should just remove support for VisualWorks (unless someone who wants to maintain the VisualWorks-support package speaks up).

[Rinzwind]

I removed the Parasol-VisualWorks package. We can add it again when smalltalkCI gets support for VisualWorks, or when someone who can maintain the package comes along.