Jack Greisman

This looks like a pretty solid start. There are a few columns that _can_ be stored in a `DataFrame`/`DataSet`, but _cannot_ be written to an MTZ file. I think a...

I agree that this makes a lot of sense to implement. There are a lot of gotchas to changing spacegroup, so it makes sense to include a built-in method that...

As we discussed offline, another gotcha that is worth documenting here is that such a method may also have to update the `DataSet.cell` attribute to shuffle around unit cell parameters....

I am just linking a related `gemmi` issue here in case the discussion becomes useful for implementing this: https://github.com/project-gemmi/gemmi/issues/87

PHENIX also has `phenix.reflection_file_converter` which appears to have a relevant `--change_to_space_group` flag. It seems to require `--expand_to_p1` to be used in conjunction in order to change a spacegroup to a...