Fix Issue #24: in the help message, options are now sorted by the option name,
not by the @Option-annotated method name in the interface.
Fix minor typos in javadocs ("iff" -> "if")
Fix Issue #24: options are now sorted by the first long name value.
Help won't appear as the last option.
Issue #24: Only sort options when lexicographic ordering is chosen.
Fixes #24: support order options by long name