Conflicts:
	samples/python2/common.py
	samples/python2/feature_homography.py
	samples/python2/plane_ar.py
	samples/python2/plane_tracker.py

This reverts commit 54d68da8.

work on #2100: pyopencv_to functions now can receive argument information through ArgInfo structure. Non-contiguous input numpy arrays are copied. In case of non-contiguous output array the TypeError is thrown.

* without border extrapolation
* with aligned write
* process 4 pixels per thread in 8u case