add rotatedBoxToCell vector order check and warning.

Functionality to add/problem to solve

In the rotatedBoxToCell cell selection, the box is defined using an origin and 3 vectors. if the vectors are not in the correct left/right-hand order, the selection box will be inside-out and not select any cells. This problem is not easy to spot since no errors or warnings are generated for this situation.

Proposal

If possible, add a check to the code and produce a warning if this situation is encountered. And make the importance of the vector order more clear in the rotatedBoxToCell documentation.

Note

I have since switched to using an external .STL file with a surfaceToCell for more complex selections, but decided to at least share my experience with the rotatedBoxToCell.