+&leftimg: Like: &rightimg

+&leftimg: Like: &rightimg
Trailing package listing is now only single line - for the primary package.
&a_href: Support: a_href('mailto:email@address');
 - Automatic content generator.
$W->{"head"} -> $W->{"head_push"}
 - IIRC currently not used.
&form_method: Fixed to always supply also: method="$method"
&img: Support also: dia, fig, sxd, sxi
&img: Incompatible change: Source must be supplied with the source extension.
&leftimg, &rightimg: @args_img can be supplied as 1==@args_img $text field.
 - IIRC currently not used.
+$W->{"js_push"}
 - Now supports "text/javascript" backward compatibility.