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/ImgTrans/Laplace_Demo.cpp

@@ -34,10 +34,10 @@ int main( int, char** argv )
   GaussianBlur( src, src, Size(3,3), 0, 0, BORDER_DEFAULT );
 
   /// Convert the image to grayscale
-  cvtColor( src, src_gray, CV_RGB2GRAY );
+  cvtColor( src, src_gray, COLOR_RGB2GRAY );
 
   /// Create window
-  namedWindow( window_name, CV_WINDOW_AUTOSIZE );
+  namedWindow( window_name, WINDOW_AUTOSIZE );
 
   /// Apply Laplace function
   Mat abs_dst;