(picture-draw-rectangle): New command.
(picture-mode-map): Add binding for picture-draw-rectangle. (picture-mode): Doc fix. (picture-rectangle-ctl): New variable. (picture-rectangle-ctr): New variable. (picture-rectangle-cbr): New variable. (picture-rectangle-cbl): New variable. (picture-rectangle-v): New variable. (picture-rectangle-h): New variable. (move-to-column-force): Function deleted; calls changed to use move-to-column. (picture-insert): New function. (picture-self-insert): Use picture-insert. (picture-current-line): New function.
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