default ability of Field Norms to mask redundant grids

[mbkuhn]

Summary

The field norm utility previously summed over all cells indiscriminately. These changes allow the field norm utility to sum over only the finest cells locally and make this the default behavior. The old form can still be used via an input flag.

Pull request type

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Checklist

The following is included:

• [x] new unit-test(s)
• [ ] new regression test(s)
• [ ] documentation for new capability

This PR was tested by running:

• the unit tests
  • [ ] on GPU
  • [x] on CPU
• the regression tests
  • [ ] on GPU
  • [ ] on CPU

[mbkuhn]

gonna add a unit test, then it should be ready