The replaces the "does not return" comments with an explicit os.Exit, which is unambigous.
Getting just the help text in response to gocryptfs -info -config external.config is confusing: https://github.com/rfjakob/gocryptfs/issues/157
Pretty-prints the config while stripping out sensitive (and uninteresting) data https://github.com/rfjakob/gocryptfs/issues/111