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"

histedit: move `continue` logic into a dedicated function When histedit "continue", there is several complicated logic to apply in order to detect intermediate changeset and concluded pending operation. This changeset extract this logic in a dedicated function to lighten the main one. No alteration to the logic is done.

histedit: rename `tip` to `topmost` I expected `tip` to be repo's tip when it was the rewritten set tip. I rename the variable to the less ambiguous `topmost`.

histedit: factorise node stripping logic Create a function dedicated to stripping a group of node. All existing duplicated code is replaced by call to this function. This new function take care of stripping known and relevant node only.

histedit: extract bookmark logic in a dedicated function This lighten the main function and will help to see future changes to this bookmark logic.

histedit: remove all usages of hex[:12] - `node.hex(n)[:12]` is the same as `node.short(n)` - `ctx.hex()[:12]` is the same as `str(ctx)`