Don't fill based on window width.

Don't fill based on window width.
Don't require facemenu; it's preloaded if applicable.

(enriched-default-right-margin, enriched-fill-after-visiting)
(enriched-text-width): Variables deleted.

(enriched-text-width): Function deleted.

(enriched-initial-annotation): Use `fill-column' rather than
enriched-text-width.

(enriched-mode): Use `add-to-list'.  Turn use-hard-newlines on by
calling function, not setting variable.

(enriched-encode): New argument ORIG-BUF; evaluate
enriched-initial-annotation in that buffer.

(enriched-decode): Turn on use-hard-newlines with function.  Use new
`set-hard-newline-properties' function.  Set fill-column from
File-Width header; re-fill paragraphs only if there is no File-Width
header.