Applied all fixes related to translating C to C++ code

Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems

samples/cpp/tutorial_code/Histograms_Matching/calcBackProject_Demo2.cpp

@@ -31,10 +31,10 @@ int main( int, char** argv )
   /// Read the image
   src = imread( argv[1], 1 );
   /// Transform it to HSV
-  cvtColor( src, hsv, CV_BGR2HSV );
+  cvtColor( src, hsv, COLOR_BGR2HSV );
 
   /// Show the image
-  namedWindow( window_image, CV_WINDOW_AUTOSIZE );
+  namedWindow( window_image, WINDOW_AUTOSIZE );
   imshow( window_image, src );
 
   /// Set Trackbars for floodfill thresholds