rework refactor _aspiringchildren by introducing _possibledestination This allows us to reuse some of the logic for evolve from _aspiringchildren for the new implementation of evolve --all. The logic is also better as some previously selected changesets may not actually evolve on the target, and some changesets that does not would not.

evolve: consider all potential candidates on bare evolve Instead of stopping at the first resolution, we returns all matches. If there is ambiguity, we abort. The function itself seems fairly flawed but will do the job in simple case.

evolve: fix an issue in the documentation of the evolve function hg evolve is solving troubles that will become children of the parent of the working copy and its descendant. This last part was omitted by mistake from the help message before.