Also fixed documentation, refactored sample.

2. Algorithm::load/save added (moved from StatModel)
3. copyrights updated; added copyright/licensing info for ffmpeg
4. some warnings from Xcode 6.x are fixed

initial commit; ml has been refactored; it compiles and the tests run well; some other modules, apps and samples do not compile; to be fixed

Conflicts:

	modules/core/src/stat.cpp

cv::Complex, cv::Point_ and cv::Point3_ are moved.

reworked nearly all of the OpenCV tests (except for opencv_gpu tests) - they now use the Google Test engine.

limited rng seed choice by 5 values in dtree, boost, rtrees, ertrees tests; hope this make them more stable.