Merge branch 'master' into delphinus-feature/cache-first

refs gh-57

* master:
  Avoid unbound variable errors on macOS.
  Improve formatting in _list().
  Improve spacing in `list`.
  Improve variable names in `list`.
  Improve alignment.
  Remove unneeded assignment in `count`.
  Count items scoped with options in `list`.
  Improve selection limit behavior in `list`.
  Update filename counting in `list` for streaming.
  Include additional test for `list` ids.
  Improve logic for displaying "omitted" in _list().
  Stream data through _list()