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/GeomConvert/GeomConvert.cdl

@@ -62,47 +62,19 @@ uses    Standard,
 is
  
   class BSplineCurveKnotSplitting;
-        --- Purpose : This algorithm searches the knot values corresponding to the 
-        --  splitting of a given B-spline curve into  several arcs with
-        --  the same continuity. The continuity order is given at the
-        --  construction time. It is possible to compute the curve arcs
-        --  corresponding to this splitting with the method of package 
-        --  SplitBSplineCurve.
-
 
   class BSplineSurfaceKnotSplitting;
-        --- Purpose :
-        --  This algorithm searches the knot values corresponding to the
-        --  splitting of a given B-spline surface into several patches with
-        --  the same continuity. The continuity order is given at the
-        --  construction time. It is possible to compute the surface patches
-        --  corresponding to the splitting with the method of package
-        --  SplitBSplineSurface.
-
 
   class BSplineCurveToBezierCurve;
-        --- Purpose : 
-        --  This algorithm converts a B-spline curve from the package Geom
-        --  into several Bezier curves.
-        
+
   class CompCurveToBSplineCurve;
-        --- Purpose : 
-        --  This algorithm converts and concat sevral curve in a 
-        --  B-spline curve.
 
   class BSplineSurfaceToBezierSurface;
-        --- Purpose : 
-        --  This algorithm converts a B-spline surface from the package Geom
-        --  into several Bezier surfaces.  
 
  class CompBezierSurfacesToBSplineSurface;
-    	---Purpose: Convert a grid of Bezier Surfaces
-    	--          that are have continuity CM to an 
-    	--          Bspline Surface that has continuity CM
-    	   
+
  class  ApproxSurface;  
-        ---Purpose: Convert a surface from Geom by an approximation method
-            --          
+
  class  ApproxCurve;  
         ---Purpose: Convert a curve from Geom by an approximation method
             --

src/GeomConvert/GeomConvert_BSplineCurveKnotSplitting.cdl

@@ -22,7 +22,8 @@ class BSplineCurveKnotSplitting   from GeomConvert
     	-- If you require curves with a minimum continuity for
     	-- your computation, it is useful to know the points
     	-- between which an arc has a continuity of a given
-    	-- order. For a BSpline curve, the discontinuities are
+      -- order. The continuity order is given at the construction time.
+      -- For a BSpline curve, the discontinuities are
     	-- localized at the knot values. Between two knot values
     	-- the BSpline is infinitely and continuously
     	-- differentiable. At a given knot, the continuity is equal

src/GeomConvert/GeomConvert_BSplineSurfaceKnotSplitting.cdl

@@ -17,7 +17,10 @@ class BSplineSurfaceKnotSplitting   from GeomConvert
 
         --- Purpose : An algorithm to determine isoparametric curves along
     	-- which a BSpline surface should be split in order to
-    	-- obtain patches of the same continuity.
+      -- obtain patches of the same continuity. The continuity order is given at the
+        --  construction time. It is possible to compute the surface patches
+        --  corresponding to the splitting with the method of package
+        --  SplitBSplineSurface.
         --  For a B-spline surface the discontinuities are localised at
         --  the knot values. Between two knots values the B-spline is
         --  infinitely continuously differentiable.  For each parametric 

src/GeomConvert/GeomConvert_CompBezierSurfacesToBSplineSurface.cdl

@@ -17,7 +17,8 @@
 class CompBezierSurfacesToBSplineSurface from GeomConvert 
 
 	---Purpose: An algorithm to convert a grid of adjacent
-    	-- non-rational Bezier surfaces into a BSpline surface.
+      -- non-rational Bezier surfaces (with continuity CM) into a
+      -- BSpline surface (with continuity CM).
     	-- A CompBezierSurfacesToBSplineSurface object
     	-- provides a framework for:
     	-- -   defining the grid of adjacent Bezier surfaces

src/GeomConvert/GeomConvert_CompCurveToBSplineCurve.cdl

@@ -20,7 +20,7 @@
 
 class CompCurveToBSplineCurve from GeomConvert 
 
-	---Purpose: Concat several curve in an BSplineCurve
+	---Purpose: Algorithm converts and concat several curve in an BSplineCurve
 
 uses
  ParameterisationType from Convert,