Add/update vthb file reader
We need to add or modify a/the vthb file reader.
- When I try to open the attached .vthb file, ParaView doesn't know which reader to use.
- In a discourse issue, Mathieu said that he was able to correctly select these files, which then didn't open correctly or crashed.
Lets start with this example, I believe from the VTK examples. (i.e., UUR)