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/TopClass/TopClass.cdl

@@ -33,29 +33,17 @@ uses
 is 
 	
     generic class Classifier2d;
-	---Purpose: Basic algorithm for 2d classifications.
-                                     
 
     generic class  FaceClassifier, FClass2d;
-	---Purpose: Algorithm for classification in a Face.
 
-	
 
 
     deferred class Intersection3d;
-	---Purpose: Describes the intersection algorithm for 3d 
-	--          classifications.    	    
-		
+
     generic class Classifier3d;
-    	---Purpose: Basic algorithm for 3d classification.
-    	          
+
     deferred class SolidExplorer;
-    	---Purpose: Defines the description of a solid for the 
-    	--          SolidClassifier.
-       
+
     generic class SolidClassifier;
-    	---Purpose: Algorithm for classification in a Solid.
-    
-    
-    
+
 end TopClass;

src/TopClass/TopClass_Classifier2d.cdl

@@ -21,7 +21,7 @@ generic class Classifier2d from TopClass
     	(TheEdge as any;
     	 TheIntersector as any)
 
-	---Purpose: 
+	---Purpose: Basic algorithm for 2d classifications.
 
 uses
     Lin2d           from gp,

src/TopClass/TopClass_Classifier3d.cdl

@@ -17,7 +17,7 @@
 generic class Classifier3d from TopClass 
     	(TheIntersector as any)  -- as Intersection3d from TopClass
 
-	---Purpose: 
+	---Purpose: Basic algorithm for 3d classification.
 
 uses
     Lin             from gp,

src/TopClass/TopClass_SolidExplorer.cdl

@@ -17,7 +17,8 @@
 deferred class SolidExplorer from TopClass 
 
 	---Purpose: Provide an   exploration of a  BRep Shape   for the
-	--          classification.
+	--          classification. Defines the description of a solid for the
+  --          SolidClassifier.
 
 uses
     Pnt          from gp,