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/DNaming/DNaming_BooleanOperationDriver.cdl

@@ -24,7 +24,7 @@ uses
      BooleanOperation from BRepAlgoAPI
 
 is
-    Create returns mutable BooleanOperationDriver from DNaming;
+    Create returns BooleanOperationDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_BoxDriver.cdl

@@ -22,7 +22,7 @@ uses
      ExtendedString from TCollection,
      MakeBox     from BRepPrimAPI
 is
-    Create returns mutable BoxDriver from DNaming;
+    Create returns BoxDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_CylinderDriver.cdl

@@ -25,7 +25,7 @@ uses
      MakeCylinder     from BRepPrimAPI
 
 is
-    Create returns mutable CylinderDriver from DNaming;
+    Create returns CylinderDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_FilletDriver.cdl

@@ -26,7 +26,7 @@ uses
      Shape            from TopoDS
 
 is
-    Create returns mutable FilletDriver from DNaming;
+    Create returns FilletDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_Line3DDriver.cdl

@@ -24,7 +24,7 @@ uses
      Wire             from TopoDS,
      Array1OfShape    from TopTools
 is
-  Create returns mutable Line3DDriver from DNaming;
+  Create returns Line3DDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_PointDriver.cdl

@@ -23,7 +23,7 @@ uses
      Function         from TFunction
 
 is
-    Create returns mutable PointDriver from DNaming;
+    Create returns PointDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_PrismDriver.cdl

@@ -24,7 +24,7 @@ uses
      MakePrism   from BRepPrimAPI, 
      Shape       from TopoDS
 is
-    Create returns mutable PrismDriver from DNaming;
+    Create returns PrismDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_RevolutionDriver.cdl

@@ -24,7 +24,7 @@ uses
      MakeRevol   from BRepPrimAPI, 
      Shape       from TopoDS
 is
-    Create returns mutable RevolutionDriver from DNaming;
+    Create returns RevolutionDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_SelectionDriver.cdl

@@ -24,7 +24,7 @@ uses
      ExtendedString   from TCollection
 
 is
-    Create returns mutable SelectionDriver from DNaming;
+    Create returns SelectionDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_SphereDriver.cdl

@@ -25,7 +25,7 @@ uses
      MakeSphere  from BRepPrimAPI, 
      Shape       from TopoDS
 is
-    Create returns mutable SphereDriver from DNaming;
+    Create returns SphereDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation

src/DNaming/DNaming_TransformationDriver.cdl

@@ -26,7 +26,7 @@ uses
      Trsf             from gp
 
 is
-    Create returns mutable TransformationDriver from DNaming;
+    Create returns TransformationDriver from DNaming;
     ---Purpose: Constructor
 
     ---Purpose: validation