Ethan Peterson

Adding explicit LU factorization within CRAM

5

# Description Another performance (and accuracy?) improvement to depletion. For some reason doing an explicit LU factorization before solving within the CRAM method seems to result in far fewer warnings...

BoundingBox inconsistency between C++ and Python

9

## Bug Description I'm getting slightly different bounding boxes out of `openmc.Cell.bounding_box` and `openmc.lib.cells[cell_id].bounding_box`. It would be nice if these two methods returned the same thing. ## Steps to Reproduce...

material library access instead of package level access

1

There are a couple of simplifications I think that could be made to improve accessing materials. I think if the user wants to access a specific material contained in one...