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/MAT2d/MAT2d.cdl

@@ -34,34 +34,18 @@ uses
 is
 
     deferred class SketchExplorer;
-    	---Purpose: SletchExplorer contains an iterator on a set of geometrys 
-	--          from Geom2d. It's use by BisectingLocus.
-	
-    
+
     class Tool2d;
-    	---Purpose: Tool2d contains  the geometrys of  the map. Tool2d
-   	--          contains the set  of the geometric's methode  used for 
-        --          the map's  computation.
 
     class Mat2d;
-        --- Purpose: The Algorithm of Computation of the Map of 
-        --           bisecting locus.
 
     class Connexion;
-    	---Purpose: a Connexion links two lines.  
 
     class MiniPath;
-        ---Purpose: MiniPath computes one minimum path  to link all the
-        --          lines of a set. 
-				
+
     class Circuit;
-    	---Purpose: EquiCircuit gives a Circuit passing by all the lines
-    	--          in a set and all the connexions of the minipath associated.
-	    
+
     class CutCurve;   
-    	---Purpose: Cuts a curve at the extremas of curvature
-	--          and at the inflections. Constructs a trimmed
-	--          Curve for each interval.
 
     class SequenceOfConnexion instantiates Sequence  from TCollection
     	    	    	    	    	    	     (Connexion from  MAT2d); 

src/MAT2d/MAT2d_Circuit.cdl

@@ -21,7 +21,8 @@ inherits
     TShared from MMgt
     
 	---Purpose: Constructs a circuit on a set of lines.
-	--          
+	--          EquiCircuit gives a Circuit passing by all the lines
+	--          in a set and all the connexions of the minipath associated.
 	--           
 
 uses

src/MAT2d/MAT2d_SketchExplorer.cdl

@@ -19,6 +19,7 @@ deferred class SketchExplorer from MAT2d
 	---Purpose: SketchExplorer  is  an iterator on  a  sketch.   A
 	--          sketch is a set of contours, each contour is a set
 	--          of curves from Geom2d.
+  --          It's use by BisectingLocus.
 
 uses