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/BRepTools/BRepTools_GTrsfModification.cdl

@@ -35,7 +35,7 @@ uses Face     from TopoDS,
 
 is
 
-    Create (T : GTrsf from gp) returns mutable GTrsfModification from BRepTools; 
+    Create (T : GTrsf from gp) returns GTrsfModification from BRepTools; 
     
     GTrsf(me: mutable)
 	---Purpose: Gives an access on the GTrsf.

src/BRepTools/BRepTools_NurbsConvertModification.cdl

@@ -37,7 +37,7 @@ uses Face     from TopoDS,
 
 is
 
-    Create returns mutable NurbsConvertModification from BRepTools; 
+    Create returns NurbsConvertModification from BRepTools; 
     
 
 

src/BRepTools/BRepTools_ReShape.cdl

@@ -36,7 +36,7 @@ uses
 
 is
 
-    Create returns mutable ReShape from BRepTools;
+    Create returns ReShape from BRepTools;
     	---Purpose: Returns an empty Reshape
 
     Clear (me: mutable);

src/BRepTools/BRepTools_TrsfModification.cdl

@@ -35,7 +35,7 @@ uses Face     from TopoDS,
      
 is
 
-    Create (T : Trsf from gp) returns mutable TrsfModification from BRepTools; 
+    Create (T : Trsf from gp) returns TrsfModification from BRepTools; 
     
     Trsf(me: mutable)
 	---Purpose: Provides access to the gp_Trsf associated with this