* refactored the remaining old-style functions in 3d and calib modules to use the new C++ API.

* extended C++ version of Levenberg-Marquardt (LM) solver to accommodate all features of the C counterpart.
* removed C version of LM solver
* made a few other little changes to make the code compile and run smoothly

modules/features2d/test/test_keypoints.cpp

@@ -40,7 +40,6 @@
 //M*/
 
 #include "test_precomp.hpp"
-#include "opencv2/core/core_c.h"
 
 namespace opencv_test { namespace {