(picture-desired-column): New variable.
(picture-update-desired-column): New function.
(picture-beginning-of-line): Set picture-desired-column to 0.
(picture-end-of-line): Set picture-desired-column to the current
column.
(picture-forward-column): Pay attention to multi-column character.
(picture-backward-column): Likewise.
(picture-move-down): Likewise.
(picture-move-up): Likewise.
(picture-movement-nw): With prefix arg, move twice columns.
(picture-movement-ne): Likewise.
(picture-movement-sw): Likewise.
(picture-movement-se): Likewise.
(picture-set-motion): Handle two-column movements.
(picture-move): Call picture-move-down or picture-forward-column
only when necessary.
(picture-insert): Pay attention to picture-desired-column.
(picture-self-insert): Likewise.
(picture-clear-column): Pay attention to multi-column character.
(picture-mode): Modify doc-string for two-column movement.
(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.
picture-mode.
(move-to-column-force, picture-end-of-line): When movement is completed,
scroll horizontally if necessary to make point visible.
(picture-beginning-of-line): New function. Exists to force horizontal
scrolling if the buffer is wide.
(picture-mode-map): Instead of rebinding common keystrokes, use
substitute-key-definition to remap all keystrokes attached to the
corresponding commands.
