[PATCH 3 of 6 REPHASE-VIEW] phases: add basic pushkey support

[Pierre-Yves David]

On 26 oct. 2011, at 18:37, Matt Mackall wrote:

> I don't know how this is going to work when you add another phase. I
> think 'liquid' and 'secret' are going to need different listkey
> namespaces.

Actually I don't think we will need major change as difference namespaces. Boundary between secret and draft changeset should me forward on pull/push the same way the one between draft and public do, any changeset detected as draft on one side but secret on the other should be made secret.