0024830: Remove redundant keyword 'mutable' in CDL declarations

Redundant keyword 'mutable' removed in CDL files.
In IGESConvGeom_GeomBuilder, unused methods MakeXY() and MakeXYZ() removed.
Method StepAP214_AutoDesignGroupAssignment::Init() replicating same method of the base class is removed as it causes CDL extraction error after above (seemingly irrelevant) changes.

src/ShapeUpgrade/ShapeUpgrade_ConvertSurfaceToBezierBasis.cdl

@@ -28,7 +28,7 @@ uses
 
 is
 
-    Create returns mutable ConvertSurfaceToBezierBasis from ShapeUpgrade;
+    Create returns ConvertSurfaceToBezierBasis from ShapeUpgrade;
     	---Purpose: Empty constructor.
     
     Build (me: mutable; Segment: Boolean) is redefined;

src/ShapeUpgrade/ShapeUpgrade_EdgeDivide.cdl

@@ -27,7 +27,7 @@ uses
 
 is
 
-    Create returns mutable EdgeDivide from ShapeUpgrade;
+    Create returns EdgeDivide from ShapeUpgrade;
     	---Purpose: Empty constructor
     
     Clear (me: mutable);

src/ShapeUpgrade/ShapeUpgrade_SplitCurve.cdl

@@ -26,7 +26,7 @@ uses
     Status         from  ShapeExtend
 is 
  
-    Create returns mutable SplitCurve from ShapeUpgrade;
+    Create returns SplitCurve from ShapeUpgrade;
     	---Purpose: Empty constructor.
 
     Init (me: mutable; First, Last: Real);

src/ShapeUpgrade/ShapeUpgrade_SplitCurve2d.cdl

@@ -24,7 +24,7 @@ uses
    
 is 
  
-    Create returns mutable SplitCurve2d from ShapeUpgrade;
+    Create returns SplitCurve2d from ShapeUpgrade;
     	---Purpose: Empty constructor.
 
     Init (me: mutable; C: Curve from  Geom2d);

src/ShapeUpgrade/ShapeUpgrade_SplitCurve3d.cdl

@@ -24,7 +24,7 @@ uses
    
 is 
  
-    Create returns mutable SplitCurve3d from ShapeUpgrade;
+    Create returns SplitCurve3d from ShapeUpgrade;
     	---Purpose: Empty constructor.
 
     Init (me: mutable; C: Curve from  Geom);

src/ShapeUpgrade/ShapeUpgrade_SplitSurface.cdl

@@ -28,7 +28,7 @@ uses
 
 is 
  
-    Create returns mutable SplitSurface from ShapeUpgrade; 
+    Create returns SplitSurface from ShapeUpgrade; 
     	---Purpose: Empty constructor.
     
     Init (me: mutable; S: Surface from Geom);  

src/ShapeUpgrade/ShapeUpgrade_SplitSurfaceAngle.cdl

@@ -22,7 +22,7 @@ class SplitSurfaceAngle from ShapeUpgrade inherits SplitSurface from ShapeUpgrad
 
 is
 
-    Create (MaxAngle: Real)  returns mutable SplitSurfaceAngle from ShapeUpgrade;
+    Create (MaxAngle: Real)  returns SplitSurfaceAngle from ShapeUpgrade;
     	---Purpose: Empty constructor.
     
     SetMaxAngle (me: mutable; MaxAngle: Real);

src/ShapeUpgrade/ShapeUpgrade_SplitSurfaceArea.cdl

@@ -21,7 +21,7 @@ class SplitSurfaceArea from ShapeUpgrade inherits SplitSurface from ShapeUpgrade
 
 
 is
-    Create returns mutable SplitSurfaceArea from ShapeUpgrade; 
+    Create returns SplitSurfaceArea from ShapeUpgrade; 
     	---Purpose: Empty constructor.
     
     NbParts(me: mutable) returns Integer;

src/ShapeUpgrade/ShapeUpgrade_SplitSurfaceContinuity.cdl

@@ -28,7 +28,7 @@ uses
 
 is
 
-    Create returns mutable SplitSurfaceContinuity from ShapeUpgrade; 
+    Create returns SplitSurfaceContinuity from ShapeUpgrade; 
         ---Purpose: Empty constructor.
 	
     SetCriterion (me: mutable; Criterion: Shape from GeomAbs);

src/ShapeUpgrade/ShapeUpgrade_WireDivide.cdl

@@ -44,7 +44,7 @@ uses
     FixSmallCurves from ShapeUpgrade
 is
 
-    Create returns mutable WireDivide from ShapeUpgrade;
+    Create returns WireDivide from ShapeUpgrade;
     	---Purpose: Empty constructor
 	
     Init (me: mutable; W: Wire from TopoDS; F: Face from TopoDS);