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/SelectBasics/SelectBasics.cdl

@@ -38,14 +38,10 @@ is
 
 
     deferred class EntityOwner;
-    ---Purpose: entity able to set multiple owners for a SensitiveEntity;
 
     class SortAlgo; 
-    ---Purpose: sort algorithm for 2D rectangles.
 
     class BasicTool;
-    ---Purpose: give Tools for sorting Selection results
-    --          (example : sensitive entities matching)
 
     class ListOfBox2d instantiates List from TCollection 
     (Box2d from Bnd);
@@ -57,7 +53,6 @@ is
 
 
     deferred class SensitiveEntity;
-    ---Purpose: general entity able to give sensitive areas 
 
 
     class ListOfSensitive instantiates List from TCollection 

src/SelectBasics/SelectBasics_BasicTool.cdl

@@ -16,7 +16,8 @@
 
 class BasicTool from SelectBasics 
 
-	---Purpose: 
+	---Purpose: give Tools for sorting Selection results
+    --          (example : sensitive entities matching)
 
 uses
     Pnt2d from gp,

src/SelectBasics/SelectBasics_SortAlgo.cdl

@@ -20,6 +20,7 @@
 class SortAlgo from SelectBasics 
 
 	---Purpose: Quickly selection of a rectangle in a set of rectangles
+	--          Sort algorithm for 2D rectangles.
 
 
 uses    Integer from Standard,