evolve: raise MultipleSuccessorsError when computing dependency for split commits We don't know how to handle dependency for split commits yet. When facing a splitted commit, instead of silently adding the first successor to the dependency list and fail later, we do nothing.

next/prev: require --merge to move with uncommitted changes This should previous common mistake.

merge with stable

Added tag 5.1.5 for changeset 1377f6a7f9ec

prepare version 5.1.5

evolve: non recursive implementation for _aspiringdescendants We switch from a N squared recursive implementation for _aspiringdescendants to a more efficient algorithm in O(len(unstable)).

evolve: distinct between '--all' and '--all --any' Before this patch, evolve --all implied evolve --all --any. With this patch evolve --all evolves all the aspiring descendants of the parent of the working copy. evolve --all --any does what evolve --all did before: evolving all the troubles in the repo. We add anew function _aspiringdescendant for this purpose

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.