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/PXCAFDoc/PXCAFDoc_Area.cdl

@@ -20,10 +20,10 @@ uses
     Real from Standard
 
 is
-    Create returns mutable Area from PXCAFDoc;
+    Create returns Area from PXCAFDoc;
 
     Create (Value     : Real from Standard)
-    returns mutable Area from PXCAFDoc;
+    returns Area from PXCAFDoc;
     
     Get (me) returns Real from Standard;
 

src/PXCAFDoc/PXCAFDoc_Centroid.cdl

@@ -21,9 +21,9 @@ uses
     
    Pnt from gp
 is
-    Create returns mutable Centroid from PXCAFDoc;
+    Create returns Centroid from PXCAFDoc;
     
-    Create (pnt: Pnt from gp) returns mutable Centroid from PXCAFDoc;
+    Create (pnt: Pnt from gp) returns Centroid from PXCAFDoc;
     
     Set (me: mutable; pnt: Pnt from gp);
     

src/PXCAFDoc/PXCAFDoc_Color.cdl

@@ -21,9 +21,9 @@ uses
     Color from Quantity
 
 is
-    Create returns mutable Color from PXCAFDoc;
+    Create returns Color from PXCAFDoc;
     
-    Create (Loc: Color from Quantity) returns mutable Color from PXCAFDoc;
+    Create (Loc: Color from Quantity) returns Color from PXCAFDoc;
     
     Set (me: mutable; Loc: Color from Quantity);
     

src/PXCAFDoc/PXCAFDoc_Datum.cdl

@@ -19,12 +19,12 @@ class Datum from PXCAFDoc inherits  Attribute from PDF
 uses
     HAsciiString  from PCollection
 is
-    Create returns mutable Datum from PXCAFDoc;
+    Create returns Datum from PXCAFDoc;
 
     Create (theName : HAsciiString from PCollection;
     	    theDescr: HAsciiString from PCollection;
             theId   : HAsciiString from PCollection)
-    returns mutable Datum from PXCAFDoc;
+    returns Datum from PXCAFDoc;
     
     GetName (me) returns HAsciiString from PCollection;
 

src/PXCAFDoc/PXCAFDoc_DimTol.cdl

@@ -21,13 +21,13 @@ uses
     HAsciiString  from PCollection,
     HArray1OfReal from PColStd
 is
-    Create returns mutable DimTol from PXCAFDoc;
+    Create returns DimTol from PXCAFDoc;
 
     Create (theKind : Integer from Standard;
     	    theVal  : HArray1OfReal from PColStd;
     	    theName : HAsciiString from PCollection;
     	    theDescr: HAsciiString from PCollection)
-    returns mutable DimTol from PXCAFDoc;
+    returns DimTol from PXCAFDoc;
     
     GetKind (me) returns Integer from Standard;
 

src/PXCAFDoc/PXCAFDoc_GraphNode.cdl

@@ -23,7 +23,7 @@ uses
     GraphNodeSequence from PXCAFDoc
 
 is
-    Create returns mutable GraphNode from PXCAFDoc;
+    Create returns GraphNode from PXCAFDoc;
     
     SetFather (me : mutable;F : GraphNode from PXCAFDoc)
     returns Integer from Standard;

src/PXCAFDoc/PXCAFDoc_Location.cdl

@@ -21,9 +21,9 @@ uses
 --    Location from TopLoc,
     Location from PTopLoc
 is
-    Create returns mutable Location from PXCAFDoc;
+    Create returns Location from PXCAFDoc;
     
-    Create (Loc: Location from PTopLoc) returns mutable Location from PXCAFDoc;
+    Create (Loc: Location from PTopLoc) returns Location from PXCAFDoc;
     
     Set (me: mutable; Loc: Location from PTopLoc);
     

src/PXCAFDoc/PXCAFDoc_Material.cdl

@@ -20,14 +20,14 @@ uses
     Real          from Standard,
     HAsciiString  from PCollection
 is
-    Create returns mutable Material from PXCAFDoc;
+    Create returns Material from PXCAFDoc;
 
     Create (theName       : HAsciiString from PCollection;
     	    theDescr      : HAsciiString from PCollection;
 	    theDensity    : Real         from Standard;
     	    theDensName   : HAsciiString from PCollection;
     	    theDensValType: HAsciiString from PCollection)
-    returns mutable Material from PXCAFDoc;
+    returns Material from PXCAFDoc;
     
     GetName (me) returns HAsciiString from PCollection;
 

src/PXCAFDoc/PXCAFDoc_Volume.cdl

@@ -19,10 +19,10 @@ class Volume from PXCAFDoc inherits Attribute from PDF
 uses 
     Real from Standard
 is
-    Create returns mutable Volume from PXCAFDoc;
+    Create returns Volume from PXCAFDoc;
 
     Create (Value     : Real from Standard)
-    returns mutable Volume from PXCAFDoc;
+    returns Volume from PXCAFDoc;
     
     Get (me) returns Real from Standard;