[update] Upcate to Calligra Qt5 HEAD
Squashed 'calligra/' changes from 204f4f0..7976913

7976913 Make rendering of styles in Sheets more deterministic under qt5
542922b components: More tweaking of zoom behaviour.
2faf064 Oops, fix the license headers of the LinkArea files

git-subtree-dir: calligra
git-subtree-split: 797691317dbc037b408779d23707d75155ac1cc7
Merge commit '4f6375ebccf906d65146ceb7a48fc50b5060b187'