shithub: puzzles

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Improve 'illegal colour' error message in icon.pl.

It actually went off this morning, after an upgrade of ImageMagick,
and I found that it contained both unprintable characters in the
colour description and the wrong variable in the coordinate display.

--- a/icons/icon.pl

+++ b/icons/icon.pl

@@ -203,7 +203,8 @@

 		$currbits += $depth;

 		if ($x < $w && defined ($pix = $data->[$y*$w+$x])) {

 		    if (!defined $pal{$pix}) {

-			die "illegal colour value $pix at pixel $i in $filename\n";

+                        my $pixprintable = unpack "H*", $pix;

+			die "illegal colour value $pixprintable at pixel ($x,$y) in $filename\n";

 		    }

 		    $currbyte |= $pal{$pix};

 		}