ldg-show: use pdf instead of ps
ldg-show: use pdf instead of ps

It looks better in my viewer and it is faster

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg