Add chdir safety to recent test
Reorg
Make contextmanager for local cd shenanigans
Fix up incorrectly passing test

Also remove some related files not needed
Failing test re: proposed -f config flag

Not actually failing due to some other BS I need to fix
in the test suite
Remove widespread use of sys.exit
Add localized explicit SystemExit catcher

And add it to _output_eq as well
Tweak outdated comment