peer: store the path object used to build a peer from a repo This is the simplest case, we so starts with it.

peer: build a `path` object on the fly when needed So now, we always have a `path` object around when building the peer

peer: have `repo.peer` take an optional `path` argument We are ready to start to actually set the value now.

peer: add a `path` attribute to peer It will start being set in the coming changesets.

peer: have a common constructor and use it For now it does not do much, but we will extend it to also store a path object soon.

peer: use a dedicated name for the `peer` constructor We want to change the argument it takes, so we rather make them different function.

peer: dissolve `_peerlookup` into its last two callers This is about to need more changes and the function won't be useful. We do it early to clarify later changes.

peer: stop having a `peer()` method on `peer()` This is already a peer, why do you want a peer if you already have one.

clone: explicitly detect the need to fetch a peer Instead of having `peer()` method on all `peer()` for this usecase, we could simply handle it explicitly.

addbranchrevs: explicitly detect the need to fetch a peer Instead of having `peer()` method on all `peer()` for this usecase, we could simply handle it explicitly.