Fix quoting issues in www.tmac.

Fix quoting issues in www.tmac.

* tmac/www.tmac (www:url_breaks_splitted): Renamed to...
(www:url_breaks_split): This.
(www->): New string to close tag singletons like <img> or <hr>.  In
XHTML mode (not implemented yet), this has to be changed from `>' to
`/>'.
(IMG): Don't use </img>
Use www->.
(PIMG, MPIMG): Don't use </img>
Use www->.
Fix doublequote issues.
(HR): Don't use </hr>.
Use www->.
(LNS): Fix doublequote issues.