[vtkusers] Migrate from VTK 4.2 to 7.0, supporting functions and libraries

[John Drescher]

> I'm a newbie to the VTK and I'm upgrading my application which is using VTK
> version 4.2 to 7.0.
>

I would stop right there. This most likely will not be an easy task
for someone that is new to VTK.

John