Previously, when help was requested on a subcommand method, the output was of listing all subcommand methods.
Now, the output is now the help for that specific method.
By default, commands like imap-backup help foo bar are handled by listing all foo methods, whereas the user probably wants the detailed help for the bar method.
By moving any initial "help" argument to after any subcommand, we get help for the requested subcommand method.