bookmarks: rename arguments/variables for source code readability Before this patch, the argument bound to the source repository of incoming bookmarks for "bookmarks.diff()" is named as "remote". But in "hg outgoing" case, this argument is bound to local repository object. In addition to it, "local"/"remote" seem to mean not the direction of propagation of bookmarks, but just the location of cooperative repositories. To indicate the direction of propagation of bookmarks clearly on the source code, this patch uses "d(st)" and "s(rc)" combination instead of "l(ocal)" and "r(emote)" one. - "repo" and "remote" arguments are renamed to "dst" and "src" - "lmarks" and "rmarks" variables are renamed to "dmarsk" and "smarks"