Fixed bug 755 (for footnotes too) and improved the read-only marking of the separator line in the edit buffer

Detailed changes:
> 	Like bug 755 but for footnotes:
> 	* utilities.el (lyskom-maybe-get-footnoted-text): New function.
>
> 	* vars.el.in (kom-pick-text-no-strategy-alist): Added better
> 	default for kom-sub-footnote.
>
> 	* commands1.el (kom-sub-comment): Print a message when there are
> 	no comments to the text rather than continue.
> 	(kom-sub-footnote): Ditto, for footnotes.
>
> 	Fix bug 755:
> 	* utilities.el (lyskom-maybe-get-commented-text): New function.
>
> 	* vars.el.in (kom-pick-text-no-strategy-alist): Added defaults for
> 	kom-sub-comment.
>
> 	* edit-text.el (lyskom-edit-insert-miscs): Make the read-only
> 	marking on the separator non-sticky at the end.
>