{* 30nov2004}{...}
{phang}
{cmd:char(}{it:n}{cmd:)} returns the character corresponding
	to ASCII code {it:n} if {break}
	1 {ul:<} {it:n} {ul:<} 255.   If {it:n} < 1 or
	{it:n} > 255,  {it:missing} ("") is returned.{p_end}