Increased the default max detections per template from 2000 to 10000 since

setting this value too low can sometimes result in the failure of the
structural_svm_object_detection_problem.

dlib/image_processing/scan_image_pyramid.h

@@ -180,7 +180,7 @@ namespace dlib
     scan_image_pyramid<Pyramid_type,Feature_extractor_type>::
     scan_image_pyramid (
     ) : 
-        max_dets_per_template(2000),
+        max_dets_per_template(10000),
         max_pyramid_levels(1000)
     {
     }

dlib/image_processing/scan_image_pyramid_abstract.h

@@ -33,7 +33,7 @@ namespace dlib
             INITIAL VALUE
                 - get_num_detection_templates() == 0
                 - is_loaded_with_image() == false
-                - get_max_detections_per_template() == 2000
+                - get_max_detections_per_template() == 10000
                 - get_max_pyramid_levels() == 1000
 
             WHAT THIS OBJECT REPRESENTS