Unbundle OpenCV#111

Open

drzraf wants to merge 5 commits intocpvrlab:masterfrom

drzraf:opencv3.4

Commits on Nov 11, 2018

use system-provided opencv headers
Raphaël Droz
committed
remove bundled opencv
Raphaël Droz
committed
openCV new header style
Raphaël Droz
committed
IPLGradientOperator includes opencv in IPLGradientOperator.h as for other modules
Raphaël Droz
committed
ci: travis, bail-out sooner if either qmake or make failed
Raphaël Droz
committed