printing: Allow more choice on how many puzzles per page
Submitted by Yanko Kaneti
This is just upstreaming of a feature request posted on redhats bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=1249417 , quote:
"When printing multiple puzzles, there's no way to customize how many puzzles per page you want to print (my default would be six, on A4, sudoku's default is two)"
Version: git master