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.

Fixed a valgrind 'Conditional jump or move depends on uninitialised value(s)' on cv::kmeans(...). The original code used points(sampleCount, 1, CV_32FC2), which confused generateCentersPP into thinking it is a 1 dimensional center, instead of 2. As a result it would set only the x variable and leave y unitialised.

Seems correct to me and builds fine

initialize TIMES variable with some default value (10)

Conflicts:
	samples/cpp/tutorial_code/ImgTrans/HoughCircle_Demo.cpp

- Added author provided fixes
- Added code example
- Added documentation fixes

content and renamed to a more sensible name. Also fixed a wrong link in the
actual display_image tutorial.

Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems