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	* rect.el (replace-rectangle): New function.

their declaration.  Below is a list of interface changes.
(apply-on-rectangle): New function, mostly replaces
`operate-on-rectangle'.  All callers changed.
(move-to-column-force): Pass new second argument to `move-to-column'.
(kill-rectangle): Added optional prefix arg to fill lines.
(delete-rectangle): Ditto.
(delete-whitespace-rectangle): Ditto.
(delete-extract-rectangle): Ditto.
(open-rectangle): Ditto.
(clear-rectangle): Ditto.
(delete-whitespace-rectangle-line): New function.
(delete-rectangle-line): Added third arg FILL.
(delete-extract-rectangle-line): Ditto.
(open-rectangle-line): Ditto.
(clear-rectangle-line): Ditto.

(close-rectangle): Define alias only once in loaddefs.el.

(operate-on-rectangle): If coerce-tabs is non-nil, call
move-to-column-force instead of move-to-column.
(insert-rectangle): Call move-to-column-force instead of
move-to-column.
(open-rectangle-line): If begextra is not zero, call
move-to-column-force.

(close-rectangle): Define as alias.

(string-rectangle): Doc fix.

(string-rectangle): Bind it.
(string-rectangle-line): Use it.
(operate-on-rectangle-lines): New variable.
(extract-rectangle-line): Update it.
(delete-extract-rectangle, extract-rectangle): Bind and use it.

the rectangle for later yanking.

(string-rectangle-line): After inserting string, insert the same
width of whitespace that we deleted earlier.
(operate-on-rectangle): Operate even if width is 0.
(open-rectangle-line): Clean up.

(string-rectangle-line): Renamed from fill-rectangle-line.

but the interface and implementation are different.

	argument instead of implementing it ourselves.
	(rectangle-coerce-tab): No longer used; deleted.

	* rect.el (open-rectangle): Leave point at the upper corner of the
	rectangle just opened, in imitation of open-line.  Fix doc typo.
	(open-rectangle-line): Use skip-chars-backward's LIM argument to
	leave spaces before the line segment's beginning undisturbed.

	* rect.el: Provide 'rect.