- allow installing samples sources on all platforms
  even if BUILD_EXAMPLES is disabled,  fixed minor
  issues in sources installation process
- use 'example_<group>_<name>' scheme for target and binary file naming
- use single function for sample executable creation

- use per-module includes instead of "opencv.hpp"
- unused function warnings
- undefined macro warning

* Add a new interface for hough transform

* Fixed warning code

* Fix HoughLinesUsingSetOfPoints based on HoughLinesStandard

* Delete memset

* Rename HoughLinesUsingSetOfPoints and add common function

* Fix test error

* Change static function name

* Change using CV_Assert instead of if-block and add integer test case

* I solve the conflict and delete 'std :: tr1' and changed it to use 'tuple'

* I deleted std::tr1::get and changed int to use 'get'

* Fixed sample code

* revert test_main.cpp

* Delete sample code in comment and add snippets

* Change file name

* Delete static function

* Fixed build error

Add demo code for cv::reduce, cv::merge and cv::split.