D7962: Implement several new print scaling options

[Nathaniel Graham]

ngraham removed a dependency: D7949: Allow to print pdf doc directly into a QPrinter.

REPOSITORY
  R223 Okular

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

To: sander, #okular, aacid, #vdg, ngraham
Cc: fvogt, bruns, okular-devel, cfeck, rkflx, michaelweghorn, ngraham, aacid, darcyshen
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