comments: describe ancestor consistently - avoid 'least common ancestor' "best" is as defined by mercurial.ancestor.ancestors: furthest from a root (as measured by longest path).

rebase: improve description of --base No Mercurial DAG has ever (!) been drawn in a way where 'up to' would apply. Instead, describe deliberatey vague and informal instead of seemingly precise but not describing the essentials: rebase the tree around the specified changeset without ancestors of dest