Tweak range definition in `rescale_intensity`
Make `intensity_range` a public function
Edit wording of docstrings
Clarify docstrings
Clarify docstrings
Add TODO for deprecation removal
Add tests for intensity_range and rename parameter
Use normal deprecation warning
Merge pull request #1032 from tonysyu/better-rescale-intensity

Tweak range definition in `rescale_intensity`