move hog::set_up_constants from constructor to compute method

if user changed CUDA device between constructor and computation,
some variables were uninitialized
(cherry picked from commit 21bbed7b)

previous implementation was not thread/stream safe, since it used constant
memory

new implementation doesn't use any global objects, so it is thread/stream safe
(cherry picked from commit 4f5d30a8)

(cherry picked from commit c147ab1e)

Everything else depends on it, after all.

(cherry picked from commit cf54e3b9)

(cherry picked from commit 6d52ea89)

Which also happens to align the non-Debian specific variables
with the ones used by upstream CMake.

(cherry picked from commit b8c60234)

Conflicts:
	cmake/OpenCVPackaging.cmake

They don't actually do anything. And even if they did, all components are
enabled by default, anyway.

(cherry picked from commit 49fe4969)

FFmpeg now requires that frames allocated with avcodec_alloc_frame are
freed with avcodec_free_frame.

(cherry picked from commit 77578d41)

Absolute destinations are not necessary, and prevent CPack from working.

(cherry picked from commit 0387f8ad)

(cherry picked from commit a87ccb9a)

(cherry picked from commit e6ac6400)

(cherry picked from commit 7bb8c500)

(cherry picked from commit cf852972)

(cherry picked from commit 9206ec30)

(cherry picked from commit be6b8476)

(cherry picked from commit ddc1b965)

(cherry picked from commit 042ff210)

use ASSERT_FLOAT_EQ to compare float values, it is more robust for
large values
(cherry picked from commit d00f36ec)

... before any exceptions occur.

(cherry picked from commit 08da247a)

(cherry picked from commit eeb99726)

(cherry picked from commit 7d8e5f62)

superres module fails to compile with the following error messages:

[100%] Building CXX object modules/superres/CMakeFiles/opencv_superres.dir/src/super_resolution.cpp.o
/opencv-2.4.10/modules/superres/src/frame_source.cpp: In function 'cv::Ptr<cv::superres::FrameSource> cv::superres::createFrameSource_Video_GPU(const string&)':
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: expected type-specifier before 'VideoFrameSource'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: could not convert '(int*)operator new(4ul)' from 'int*' to 'cv::Ptr<cv::superres::FrameSource>'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: expected ';' before 'VideoFrameSource'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:41: error: 'VideoFrameSource' was not declared in this scope
/opencv-2.4.10/modules/superres/src/frame_source.cpp:264:1: error: control reaches end of non-void function [-Werror=return-type]
cc1plus: some warnings being treated as errors
make[3]: *** [modules/superres/CMakeFiles/opencv_superres.dir/src/frame_source.cpp.o] Error 1
make[3]: *** Waiting for unfinished jobs....

This is caused because the return value of the createFrameSource_Video_GPU function should be a VideoFrameSource_GPU object.
(cherry picked from commit 2e393ab8)

Install symlinks to shared libraries as a part of development package,
not runtime package.

It is default behavior for debian packages.
(cherry picked from commit f55c1cc0)

(cherry picked from commit 84f33d05)

(cherry picked from commit 5c07e0b6)

(cherry picked from commit e0827069)