Initial update for cups-pdf
This optional update introduces cups-pdf to 42.2.
cups-pdf is a PDF writer backend or CUPS.
It provides a virtual CUPS-PDF printer which produces PDF file so that
application programs which have no built-in support to "Save as PDF"
could print to CUPS-PDF to get a PDF file.
- Submitted by Luigi Baldoni (alois)
Fixed bugs
bnc#1020127
Leap 42.2 lacks a virtual PDF printer