Make case, line width consistent, reorganize code (not alphabetized => annoying to figure out what's not taken yet, etc.)
This is in 1.4 because I'm doing it right now anyway as part of implementing #12.
Clean up env-var-facing CLI option code re #532
More cleanup (capitalization, metavars) re #532
Alphabetize main.py cmdline opts too re #532
Changelog re #532