Merge remote-tracking branch 'master' into stitch-fix

* 'master' of github.com:itseez/opencv: (82 commits)
  moved part of video to contrib/{outflow, bgsegm}; moved matlab to contrib
  added some basic functionality needed by the new face module (moved from the old "contrib")
  moved to the new opencv_contrib/face module
  fixed various warnings and obvious errors reported by clang compiler and the coverity tool.
  Fixed review comment from Vadim Pisarevsky
  modified farneback sample to use T-API
  ECC patch by the author (G. Evangelidis); fixed some OCL Farneback optical flow test failures on Mac
  small fix for GaussianBlur ocl test
  fix binary package build
  small fix for ocl_resize
  fix IOS framework
  fixed test ocl_MatchTemplate for sparse matrix
  Fixed typos
  fixing error, wrong template method param.
  fixing Mac build
  some formal changes (generally adding constness)
  Fixed choice of kercn and rowsPerWI for non-Intel device.
  fixed nDiffs for CalcBackProject
  fixed tests for ocl_filter2d, ocl_matchTemplate, ocl_histogram.cpp
  Fixed issue: Mat::copyTo(UMat) if device copy is obsolete. Added test.
  ...

Conflicts:
	modules/core/include/opencv2/core/mat.inl.hpp

modules/videoio/src/cap_qtkit.mm

@@ -199,7 +199,6 @@ public:
 private:
     IplImage* argbimage;
     QTMovie* mMovie;
-    unsigned char* imagedata;
 
     NSString* path;
     NSString* codec;