D7962: Implement several new print scaling options

[Albert Astals Cid]

aacid requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D7962

To: sander, #okular, aacid
Cc: cfeck, rkflx, michaelweghorn, ngraham, aacid