[Paraview] Integrate Variables + Boxes

[Bastil2001 at yahoo.de]

Today I had a funny time with th eIntegrate Variables Filter. I got
reasonable results for variables and volumes but both were negative
instead of positive.... Strange.
I also had some fun in positioning an ExtractMeshByRegion Box using
Tranlation/Rotation/Scale. Especially translation is unclear to me how
it works. Why does in not use the Center and length convention from the
Box-source? I used a box-source to position my extraction.

Regards BastiL