[PATCH 0 of 1] Adding parent IDs to MQ patch files.

[Bill Barry]

Steve Losh wrote:
> Some of the cool things we'll be able to do once this is in place:
>
> * Add `qpush --refresh` to automatically push and refresh a patch (and
>   therefore the parent ID) if it applies cleanly.
>   
> * Add `qpush --be-smart-about-merging` which uses rebase techniques to
>   intelligently apply patches that otherwise would result in .rej files.
>
> * Add `qpush --where-it-belongs` which would push patches to the place they
>   last applied cleanly.

The first two are implicitly done in Attic at the moment if anyone is 
looking for some code examples of how these could be done (the final 
doesn't make sense for Attic but will be available when I get around to 
enveloping mq functionality).