evolve: improve graft handling of -O we now resolve changeset reference before graft

obsolete: improve rebase compat

import some doc

obsolete: define an unstable property on context

kill: properly get revision pointed by --new Previously the raw value on --new ended in the obsolete file.

stabilize: proper --quiet behavior

stabilize: stabilize my topological branch only if not stated otherwize.

Add a bosancestors revset

add an obsolete parent revset and related alias

overwrite user not date

remove useless hidden related stuff in amend

add user to the list of option prevent the "no change found" message to show up

evolve that does something \o/

stuff that pass

fix evolve test