introducing a tutorial for the retina model
adding retina tutorial
updated tutorial, need spell check, validation, nicer images and a discussion on parameters
updated tutorial, rapid spell check, retina parameters discussion added
added retina code tutorial
updated first image sample
minor update
minor updates for doc redirections and tutorial images size
Fix a compilation error when HAVE_CLAMDFFT is on.
Move legacy part of opencv_contrib to separate header
Drop old python interface
Drop old python samples and tests
Remove documentation for old python wrapper
Turn pyopencv_to and pyopencv_from into templates

This protects from unwanted implicit conversions between types at compile time.
Add HammingDist test case
Untabify
Pass query type T into kernel
Enable runtime type definition in kernels
Allow more input query/train types for ocl::bfmatcher

RadiusMatch for HammingDist cannot pass yet.
Allow more query/train types for ocl::bfmatcher