topic: 'hg evolve --all' pick all trouble within current topic
This is the first changeset of a collaboration between the topic extensions and
evolve. If there is an active topic, 'hg evolve --all' will try to fix all
changesets in that topic wherever they are. Aspiring descendant that are not in
the current topic will be ignored.
For now, evolve behave as usual if there is no active topic. This is a bit
inconsistent and will probably be unified in the future.