- Added rectangless.

- Moved all uses of PYBIND11_MAKE_OPAQUE to a common header to avoid possilbe ODR violations.
- Added python binding for make_bounding_box_regression_training_data().

tools/python/src/shape_predictor.cpp

 // Copyright (C) 2014  Davis E. King (davis@dlib.net)
 // License: Boost Software License   See LICENSE.txt for the full license.
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include <dlib/geometry.h>
 #include <dlib/image_processing.h>

tools/python/src/simple_object_detector_py.h

@@ -3,6 +3,7 @@
 #ifndef DLIB_SIMPLE_OBJECT_DETECTOR_PY_H__
 #define DLIB_SIMPLE_OBJECT_DETECTOR_PY_H__
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include <dlib/matrix.h>
 #include <dlib/geometry.h>

tools/python/src/svm_c_trainer.cpp

 // Copyright (C) 2013  Davis E. King (davis@dlib.net)
 // License: Boost Software License   See LICENSE.txt for the full license.
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include "testing_results.h"
 #include <dlib/matrix.h>

tools/python/src/svm_rank_trainer.cpp

 // Copyright (C) 2013  Davis E. King (davis@dlib.net)
 // License: Boost Software License   See LICENSE.txt for the full license.
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include <dlib/matrix.h>
 #include <dlib/svm.h>
@@ -12,12 +13,7 @@ using namespace std;
 namespace py = pybind11;
 
 typedef matrix<double,0,1> sample_type; 
-typedef std::vector<std::pair<unsigned long,double> > sparse_vect;
-typedef std::vector<ranking_pair<sample_type> > ranking_pairs;
-typedef std::vector<ranking_pair<sparse_vect> > sparse_ranking_pairs;
 
-PYBIND11_MAKE_OPAQUE(ranking_pairs);
-PYBIND11_MAKE_OPAQUE(sparse_ranking_pairs);
 
 // ----------------------------------------------------------------------------------------
 

tools/python/src/svm_struct.cpp

 // Copyright (C) 2013  Davis E. King (davis@dlib.net)
 // License: Boost Software License   See LICENSE.txt for the full license.
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include <dlib/matrix.h>
 #include <dlib/svm.h>

tools/python/src/vector.cpp

 // Copyright (C) 2013  Davis E. King (davis@dlib.net)
 // License: Boost Software License   See LICENSE.txt for the full license.
 
+#include "opaque_types.h"
 #include <dlib/python.h>
 #include <dlib/matrix.h>
 #include <dlib/geometry/vector.h>
@@ -12,7 +13,6 @@ using namespace std;
 
 typedef matrix<double,0,1> cv;
 
-PYBIND11_MAKE_OPAQUE(std::vector<point>);
 
 void cv_set_size(cv& m, long s)
 {