Improve comments to indicate actual usage of WORDS_BIGENDIAN where
it is tested with #ifdef rather than #if

EMBED_CUDA and FORCE_EMBED_OPENCV flags added to cmake macro add_android_project;
INSTALL_CUDA_LIBRARIES option added to OpenCV.mk
opencv_dynamicuda library installation with enabled OPENCV_INSTALL_MODULES flag fixed;
CUDA initialization apportunity added to OpenCVLoader.initDebug();
Tutorial-4-CUDA sample reimplemented with static OpenCV and CUDA initialization.

Added opencv_testing.sh.in file;
opencv_testing.sh installation guarded by OS check.

Env setup for testing package implemented using /etc/profile.d;
Variable with path for all native samples added;
Path for test binaries and test data updated.

After #1801, the include directories are no longer added automatically,
so we should show the user how to do that.

This is the preferred style nowadays, and more consistent with the
rest of the code.

Fixes <http://answers.opencv.org/question/23997/opencv-247-cmake-includes-all-modules-even-if-i/>.

Epoch is gone; now the version component names in C++ and CMake
are consistent (except REVISION corresponds to PATCH).

The general convention is <output file name> + ".in".

This is something that should be left to the user, that's the whole
point of OpenCV_INCLUDE_DIRS.

Allow to build samples via OpenCV binaries from distribution package
(find_package with OpenCV_DIR).

Support functions from OpenCL 1.1 / OpenCL 1.2