chhold hscript command

Puts channels into “hold” or “pending” state.

Usages

You can use this with the chcommit to force the creation of keys.

`-b channel_patterns`	(Begin) Set the hold status of the given channels so that they remain in a “pending” state even if time changes.
`-e [channel_patterns]`	(End) Releases held channels. If no pattern is given, releases all channels.
`-s`	Prints the current hold status.
`-l`	Lists currently held channels.