[update] Upcate to Calligra Qt5 HEAD
Squashed 'calligra/' changes from 7976913..a4a9fb8

a4a9fb8 Add controller zoom to the Viewer example's link area
7a221ca Add an understanding of the view controller's internal zoom to the link area

git-subtree-dir: calligra
git-subtree-split: a4a9fb8e852a85f9de5eb2016fbbbaf153a76f35
Merge commit '7ccc5660220462a6e0744e03a43398be95a7fc86'