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/GeomAdaptor/GeomAdaptor.cdl

@@ -32,19 +32,13 @@ uses
 
 is
       class Curve; 
-        ---Purpose: creation of the loaded curve the curve is C1 by piece.
-        --          Inherits  Curve from Adaptor3d 
 
       class Surface;
-        ---Purpose: creation of the loaded surface the surface is C1 by piece 
-        --          Inherits  Surface from Adaptor3d 
 
       private class GHSurface instantiates GenHSurface from Adaptor3d
       	    (Surface from GeomAdaptor);
 	    
       class HSurface;
-	---Purpose: Inherited  from    GHSurface.   Provides a  surface
-	--          handled by reference.
 
       private class GHCurve instantiates GenHCurve from Adaptor3d
             (Curve from GeomAdaptor);

src/GeomAdaptor/GeomAdaptor_Curve.cdl

@@ -18,7 +18,8 @@ class Curve from GeomAdaptor inherits Curve from Adaptor3d
         
     	---Purpose: This class provides an interface between the services provided by any
     	-- curve from the package Geom and those required of the curve by algorithms which use it.
-        
+      -- Creation of the loaded curve the curve is C1 by piece.
+
 uses Vec                  from gp,
      Pnt                  from gp,
      Circ                 from gp,

src/GeomAdaptor/GeomAdaptor_HSurface.cdl

@@ -19,6 +19,7 @@ class HSurface from GeomAdaptor inherits GHSurface from GeomAdaptor
     	---Purpose: An interface between the services provided by any
     	-- surface from the package Geom and those required
     	-- of the surface by algorithms which use it.
+      -- Provides a  surface handled by reference.
 
 uses
     Surface from Geom,

src/GeomAdaptor/GeomAdaptor_Surface.cdl

@@ -19,7 +19,7 @@ class Surface from GeomAdaptor inherits Surface from Adaptor3d
     	---Purpose: An interface between the services provided by any
     	-- surface from the package Geom and those required
     	-- of the surface by algorithms which use it.
-        
+      -- Creation of the loaded surface the surface is C1 by piece
 uses
      Pnt              from gp,
      Vec              from gp,