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/HLRAlgo/HLRAlgo.cdl

@@ -61,26 +61,19 @@ is
     	(BiPoint from HLRAlgo);
 
     class PolyShellData;
-	---Purpose: All the PolyData of a Shell
-    
+
     class PolyInternalData;
-	---Purpose: to Update OutLines.
-    
+
     class PolyInternalSegment;
-	---Purpose: to Update OutLines.
-    
+
     class PolyInternalNode;
-	---Purpose: to Update OutLines.
-    
+
     class PolyData;
-	---Purpose: Data structure of a set of Triangles.
-    
+
     class PolyHidingData;
-	---Purpose: Data structure of a set of Hiding Triangles.
-    
+
     class TriangleData;
-	---Purpose: Data structure of a triangle.
-    
+
     class Array1OfPHDat            instantiates Array1       from TCollection
     	(PolyHidingData from HLRAlgo);
 	
@@ -110,22 +103,15 @@ is
          Array1OfTData from HLRAlgo);
 	
     class PolyAlgo;
-	---Purpose: to remove Hidden lines on Triangulations.
-    
+
     class EdgeStatus;
-	---Purpose: This class describes the  visible-hidden Status of
-	--          an Edge and its parametric bounds.
-	
+
     class Projector;
-    	---Purpose: To transform and project Points and Planes.
-	
+
     class Intersection;
-	---Purpose: Parameter and State (above, on or under the face).
 
     class Coincidence;
-	---Purpose: A coincidence  describes the geometry  of the edge
-	--          of the hiding face around the intersection.
-	
+
     class Interference             instantiates Interference from TopBas
     	(Intersection from HLRAlgo, 
 	 Coincidence  from HLRAlgo);
@@ -134,11 +120,9 @@ is
     	(Interference from HLRAlgo);
 	
     class EdgesBlock;
-	---Purpose: A set of oriented Edges. (A wire).
-    
+
     class WiresBlock;
-	---Purpose: A set of Wires. (A face).
-    
+
     class EdgeIterator;
 	---Purpose: Iterator  on the  visible or  hidden  parts of  an
 	--          EdgeStatus.

src/HLRAlgo/HLRAlgo_PolyData.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyData from HLRAlgo inherits TShared from MMgt
+  ---Purpose: Data structure of a set of Triangles.
 
 uses
     Address          from Standard,

src/HLRAlgo/HLRAlgo_PolyHidingData.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyHidingData from HLRAlgo
+  ---Purpose: Data structure of a set of Hiding Triangles.
 
 uses
     Address from Standard,

src/HLRAlgo/HLRAlgo_PolyInternalData.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyInternalData from HLRAlgo inherits TShared from MMgt
+	---Purpose: to Update OutLines.
 
 uses
     Address          from Standard,

src/HLRAlgo/HLRAlgo_PolyInternalNode.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyInternalNode from HLRAlgo inherits TShared from MMgt
+	---Purpose: to Update OutLines.
 
 uses
     Address from Standard,

src/HLRAlgo/HLRAlgo_PolyInternalSegment.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyInternalSegment from HLRAlgo
+	---Purpose: to Update OutLines.
 
 uses
     Address from Standard,

src/HLRAlgo/HLRAlgo_PolyShellData.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class PolyShellData from HLRAlgo inherits TShared from MMgt
+	---Purpose: All the PolyData of a Shell
 
 uses
     Address            from Standard,

src/HLRAlgo/HLRAlgo_Projector.cdl

@@ -16,6 +16,7 @@
 
 class Projector from HLRAlgo
 ---Purpose: Implements a  projector object.
+-- To transform and project Points and Planes.
 -- This object is designed to be used in the
 -- removal of hidden lines and is returned by the
 -- Prs3d_Projector::Projector function.

src/HLRAlgo/HLRAlgo_TriangleData.cdl

@@ -15,6 +15,7 @@
 -- commercial license or contractual agreement.
 
 class TriangleData from HLRAlgo
+  ---Purpose: Data structure of a triangle.
 
 uses
     Address from Standard,