Add cycle and nbtotal to hst

[pdmullen]

PR Summary

This PR adds the cycle and total number of MeshBlocks to the history file output. If we choose to merge this one, please merge it after #1127.

PR Checklist

• [x] Code passes cpplint
• [x] New features are documented.
• [ ] Adds a test for any bugs fixed. Adds tests for new features.
• [x] Code is formatted
• [x] Changes are summarized in CHANGELOG.md
• [x] Change is breaking (API, behavior, ...)
  • [x] Change is additionally added to CHANGELOG.md in the breaking section
  • [x] PR is marked as breaking
  • [x] Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• [ ] CI has been triggered on Darwin for performance regression tests.
• [x] Docs build
• [x] (@lanl.gov employees) Update copyright on changed files

[pdmullen]

👍 Two things:

1. Can you make sure that the isntrucitons for checking correctness in benchmark/burgers still work?
2. Make sure this only goes in after Add WithFluxes to IsRefined check #1127

Just went through the benchmark/burgers test. It looks like it was shipping its own custom nbtotal reduction. I eliminated this since this data is now outputted to hst by default. The new history files are compatible with the burgers_diff.py script, however, I'd note that this script had a bug in it such that no diffs would ever actually be reported --- fixed now.

[Yurlungur]

👍 Two things:

1. Can you make sure that the isntrucitons for checking correctness in benchmark/burgers still work?
2. Make sure this only goes in after Add WithFluxes to IsRefined check #1127

Just went through the benchmark/burgers test. It looks like it was shipping its own custom nbtotal reduction. I eliminated this since this data is now outputted to hst by default. The new history files are compatible with the burgers_diff.py script, however, I'd note that this script had a bug in it such that no diffs would ever actually be reported --- fixed now.

Thanks @pdmullen !