CMake: compiler flags splitted into CMAKE_C_FLAGS and CMAKE_CXX_FLAGS.
CMake: -g option added to compiler flags.
tests: C bindings test added.
measuring_points, events: strictly recommended to use "full" (specifying value type) attribute's measuring points instead of common HANDY_ATTRIBUTE_SET.
measuring_points: attribute's measuring_points fixed (HANDY_ATTRIBUTE_SET_JSON removed, HANDY_ATTRIBUTE_SET_STRING fixed).