Simplify init-repo

[Andrew Bennetts]

John Arbash Meinel wrote:
> Matthew Fuller brought this up in IRC, what does everyone else think?
>
> (2:48:16 PM) ***fullermd thinks the format list in init-repo's help should 
> be a
> little less...
> (2:51:43 PM) jam: well, it would seem that --metaweave should be hidden by 
> now
> (2:51:50 PM) jam: and probably --weave
> (2:51:58 PM) jam: and maybe --knit
> (2:52:40 PM) jam: I might hide --rich-root for only --rich-root-pack
> (2:52:59 PM) jam: because if you are going for --rich-root you are 
> incompatible
> with pre-packs anyway
>
> It would be nice if "--default" could say
>
> ~  --default	The current default format (dirstate-tags)
>
> Or something rather than repeating the help text of the format.

I'm +1 on all these.

The only bit I'm hesitant about is hiding --knit, but we've had packs for quite
a few releases by now, so there's not really any need to keep promoting it.

-Andrew.