Fortify echo; one URI per line

Fortify against bad characters in URLs.  This also makes www print one
URI per line (which was intended in the first place).

bin/saturnin-www.skel

 test -z "$uri" && uri="$(clipln | find_uri)"
 test -z "$uri" && uri="$(iniread -p www.bookmark.default)"
 
-echo $uri
+echo "$uri"