- CV_RGB() macro is moved into opencv2/imgproc.hpp from imgproc_c.h
- samples/cpp/filestorage_base64.cpp is dropped

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

responses must be float, else we trigger an assertion in line 150

Added some asserts.

Added new test (separating two points)

Also fixed documentation, refactored sample.