0024784: Move documentation in CDL files to proper location

Mostly duplicated comments were removed and missing ones were moved
into dedicated class CDL files.
Some more duplicated comments were removed from CDL files.
Correction of merge

src/Hatch/Hatch.cdl

@@ -42,19 +42,15 @@ is
 
 
     private class Parameter;
-	---Purpose: Used   by the Hatcher to  store  a parameter on  a
-	--          line. 
-	
+
     private class SequenceOfParameter instantiates Sequence from TCollection
     	    (Parameter from Hatch);
 
     private class Line;
-	---Purpose: Used by the Hatcher to store a line.
 
     private class SequenceOfLine instantiates Sequence from TCollection
     	    (Line from Hatch);
 	    
     class Hatcher;
-	---Purpose: The Hatching algorithm.
 
 end Hatch;