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/Bisector/Bisector.cdl

@@ -38,23 +38,13 @@ is
     deferred class Curve;
     
    	     class BisecAna;
-    	     --- Purpose: This class provides the bisecting line between two
-    	     --           geometric elements.The elements are Circles,Lines or
-    	     --           Points. 
 
     	     class BisecPC;
-	     ---Purpose: This class provides the bisecting line between a point
-	     --          a Curve.
-    
+
     	     class BisecCC;	
-	     ---Purpose: This class provides the bisecting line between two
-	     --          Curves. 
 
     class Bisec;
-	---Purpose: This class provides the bisecting line between two
-	--          geometris  elelements.  The   bisecting   line  is
-	--          trimmed by a point, 
-    
+
     class Inter;
     
     class PointOnBis;

src/Bisector/Bisector_BisecAna.cdl

@@ -16,7 +16,9 @@
 
 class BisecAna from Bisector
 
-    --- Purpose :
+    --- Purpose : This class provides the bisecting line between two
+    --            geometric elements.The elements are Circles,Lines or
+    --            Points.
 
 inherits