symmetricdifference: move back to copies It's too tightly dependent on known revlog ordering to fit well in ancestors

symmetricdifference: change colors to sides

ancestors: simplify symmetric difference - n_wanted/wanted -> interesting - scan colors rather than managing ret

copies: don't double-detect items in the directory copy check

copies: skip directory rename checks when not merging The directory rename checks are not meaningful unless we're moving or copying files across a branch during a merge.

copies: sort old names by depth

backout: reverse changeset belongs on current branch Backing out a changeset that is before a named branch branchpoint was making the reverse changeset the tip of the old branch, which is wrong and very confusing. So instead, we put it on the current named branch.

copies: fix silly precedence bug

churn: allow whitespaces as delimiter in aliases it was exactly on space character before.

merge with crew