bookmarks: reuse @number bookmark, if it refers changeset referred remotely Before this patch, "@number" suffixed bookmark may be newly created at each "hg pull" from the remote repository, if the bookmark in remote repository diverges from one in local one. This causes unexpected increase of "@number" suffixed bookmarks. This patch reuses "@number" suffixed bookmark, if it refers the changeset which is referred by the same bookmark in the remote repository.