Revise *status and *controlpanel help output

The list of available commands is quite exhausting. These changes make it possible for users to filter the help output.
Nice idea. Starting to look good:

	<jpnurmi> help setchan d
	<*controlpanel> +---------+------------------------------------------------+-------------------------------------------------+
	<*controlpanel> | Command | Arguments | Description |
	<*controlpanel> +---------+------------------------------------------------+-------------------------------------------------+
	<*controlpanel> | SetChan | <variable> <username> <network> <chan> <value> | Sets the variable's value for the given channel |
	<*controlpanel> +---------+------------------------------------------------+-------------------------------------------------+
	<*controlpanel> The following variables are available when using the SetChan/GetChan commands:
	<*controlpanel> +----------+----------------------+
	<*controlpanel> | Variable | Type |
	<*controlpanel> +----------+----------------------+
	<*controlpanel> | DefModes | String |
	<*controlpanel> | Detached | Boolean (true/false) |
	<*controlpanel> +----------+----------------------+