(ansi-colors): Doc change.

(ansi-colors): Doc change.
(ansi-color-get-face): Simplified regexp.
(ansi-color-faces-vector): Added more faces, doc change.
(ansi-color-names-vector): Doc change.
(ansi-color-regexp): Simplified regexp.
(ansi-color-parameter-regexp): New regexp.
(ansi-color-filter-apply): Doc change.
(ansi-color-filter-region): Doc change.
(ansi-color-apply): Use ansi-color-regexp and ansi-color-get-face,
deal with zero length parameters.
(ansi-color-apply-on-region): Doc change.
(ansi-color-map): Doc change.
(ansi-color-map-update): Removed debugging message.
(ansi-color-get-face-1): Added condition-case to trap
args-out-of-range errors.
(ansi-color-get-face): Doc change.
(ansi-color-make-face): Removed.
(ansi-color-for-shell-mode): New option.