Detect more types of layers that should be shown with holes.

scripts/gerber2png

@@ -71,8 +71,7 @@ for f in "$@" ; do
done

for f in $ALL_THE_FILES ; do
    if [[ "$f" == *.g?l ]] ; then  # gtl or gbl
	#echo "$f - in copper"
    if [[ "$f" == *.g?l || "$f" == *.g[23]* ]] ; then  # gtl, gbl or inner
	# Copper layers should have the drill layer ... if available
	$GERBV -xps -o/tmp/gerbvtmp.$$.ps $DRILL_LAYER $SHOWN_COLOR "$f" $BACKGROUND_LAYERS 2>/dev/null
    else