Merge remote-tracking branch 'upstream/2.4' into merge-2.4

* #1538 from StevenPuttemans:bugfix_3283
* #1545 from alalek:ocl_test_fix_rng
* #1551 from alalek:cmake_install_win
* #1570 from ilya-lavrenov:ipp_warn_fix
* #1573 from alalek:perf_simple_strategy
* #1574 from alalek:svm_workaround
* #1576 from alalek:ocl_fix_cl_double
* #1577 from ilya-lavrenov:ocl_setto_opencl12
* #1578 from asmorkalov:android_fd_cp_fix
* #1579 from ilya-lavrenov:ocl_norm
* #1582 from sperrholz:ocl-arithm-additions
* #1586 from ilya-lavrenov:ocl_setto_win_fix
* #1589 from ilya-lavrenov:pr1582_fix
* #1591 from alalek:ocl_remove_cl_hpp_h
* #1592 from alalek:ocl_program_cache_update
* #1593 from ilya-lavrenov:ocl_war_on_double
* #1594 from ilya-lavrenov:ocl_perf
* #1595 from alalek:cl_code_cleanup
* #1596 from alalek:test_fix_run_py
* #1597 from alalek:ocl_fix_cleanup
* #1598 from alalek:ocl_fix_build_mac
* #1599 from ilya-lavrenov:ocl_mac_kernel_warnings
* #1601 from ilya-lavrenov:ocl_fix_tvl1_and_sparse
* #1602 from alalek:ocl_test_dump_info
* #1603 from ilya-lavrenov:ocl_disable_svm_noblas
* #1605 from alalek:ocl_fixes
* #1606 from ilya-lavrenov:ocl_imgproc
* #1607 from ilya-lavrenov:ocl_fft_cleanup
* #1608 from alalek:fix_warn_upd_haar
* #1609 from ilya-lavrenov:ocl_some_optimization
* #1610 from alalek:ocl_fix_perf_kalman
* #1612 from alalek:ocl_fix_string_info
* #1614 from ilya-lavrenov:ocl_svm_misprint
* #1616 from ilya-lavrenov:ocl_cvtColor
* #1617 from ilya-lavrenov:ocl_info
* #1622 from a0byte:2.4
* #1625 from ilya-lavrenov:to_string

Conflicts:
	cmake/OpenCVConfig.cmake
	cmake/OpenCVDetectPython.cmake
	cmake/OpenCVGenConfig.cmake
	modules/core/CMakeLists.txt
	modules/nonfree/src/surf.ocl.cpp
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/include/opencv2/ocl/private/util.hpp
	modules/ocl/perf/main.cpp
	modules/ocl/src/arithm.cpp
	modules/ocl/src/cl_operations.cpp
	modules/ocl/src/cl_programcache.cpp
	modules/ocl/src/color.cpp
	modules/ocl/src/fft.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/gemm.cpp
	modules/ocl/src/haar.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/src/matrix_operations.cpp
	modules/ocl/src/pyrlk.cpp
	modules/ocl/src/split_merge.cpp
	modules/ocl/src/svm.cpp
	modules/ocl/test/main.cpp
	modules/ocl/test/test_fft.cpp
	modules/ocl/test/test_moments.cpp
	modules/ocl/test/test_objdetect.cpp
	modules/ocl/test/test_optflow.cpp
	modules/ocl/test/utility.hpp
	modules/python/CMakeLists.txt
	modules/ts/include/opencv2/ts.hpp
	modules/ts/src/ts_perf.cpp
	samples/android/face-detection/jni/DetectionBasedTracker_jni.cpp

modules/imgproc/doc/structural_analysis_and_shape_descriptors.rst

@@ -293,8 +293,6 @@ Calculates the up-right bounding rectangle of a point set.
 The function calculates and returns the minimal up-right bounding rectangle for the specified point set.
 
 
-
-
 contourArea
 ---------------
 Calculates a contour area.
@@ -417,6 +415,7 @@ Fits an ellipse around a set of 2D points.
         * Nx2 numpy array (Python interface)
 
 The function calculates the ellipse that fits (in a least-squares sense) a set of 2D points best of all. It returns the rotated rectangle in which the ellipse is inscribed. The algorithm [Fitzgibbon95]_ is used.
+Developer should keep in mind that it is possible that the returned ellipse/rotatedRect data contains negative indices, due to the data points being close to the border of the containing Mat element.
 
 .. note::
 
@@ -539,7 +538,7 @@ Finds a rotated rectangle of the minimum area enclosing the input 2D point set.
         * Nx2 numpy array (Python interface)
 
 The function calculates and returns the minimum-area bounding rectangle (possibly rotated) for a specified point set. See the OpenCV sample ``minarea.cpp`` .
-
+Developer should keep in mind that the returned rotatedRect can contain negative indices when data is close the the containing Mat element boundary.
 
 
 boxPoints