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/HLRAlgo/HLRAlgo_EdgesBlock.cdl

@@ -40,7 +40,7 @@ uses
 is
     Create(NbEdges : Integer)
 	---Purpose: Create a Block of Edges for a wire.
-    returns mutable EdgesBlock from HLRAlgo;
+    returns EdgesBlock from HLRAlgo;
     
     NbEdges(me) returns Integer from Standard
     	---C++: inline

src/HLRAlgo/HLRAlgo_PolyAlgo.cdl

@@ -30,7 +30,7 @@ uses
     
 is
     Create
-    returns mutable PolyAlgo from HLRAlgo;
+    returns PolyAlgo from HLRAlgo;
     
     Init(me : mutable; HShell : HArray1OfTransient from TColStd)
     is static;

src/HLRAlgo/HLRAlgo_PolyData.cdl

@@ -29,7 +29,7 @@ uses
     EdgeStatus       from HLRAlgo
 
 is
-    Create returns mutable PolyData from HLRAlgo;
+    Create returns PolyData from HLRAlgo;
 
     HNodes(me : mutable; HNodes : HArray1OfXYZ from TColgp)
     is static;

src/HLRAlgo/HLRAlgo_PolyInternalData.cdl

@@ -30,7 +30,7 @@ uses
 
 is
     Create(nbNod, nbTri : Integer from Standard)
-    returns mutable PolyInternalData from HLRAlgo;
+    returns PolyInternalData from HLRAlgo;
     
     UpdateLinks(me    : mutable;
                 TData : out Address from Standard;

src/HLRAlgo/HLRAlgo_PolyInternalNode.cdl

@@ -21,7 +21,7 @@ uses
     Integer from Standard
     
 is
-    Create returns mutable PolyInternalNode from HLRAlgo; 
+    Create returns PolyInternalNode from HLRAlgo; 
     	---C++: inline
     
     Indices(me) returns Address from Standard

src/HLRAlgo/HLRAlgo_PolyShellData.cdl

@@ -26,7 +26,7 @@ uses
 
 is
     Create(nbFace : Integer from Standard)
-    returns mutable PolyShellData from HLRAlgo;
+    returns PolyShellData from HLRAlgo;
 
     UpdateGlobalMinMax(me        : mutable;
                        TotMinMax : Address from Standard)

src/HLRAlgo/HLRAlgo_WiresBlock.cdl

@@ -33,7 +33,7 @@ uses
 is
     Create(NbWires : Integer from Standard)
 	---Purpose: Create a Block of Blocks.
-    returns mutable WiresBlock from HLRAlgo;
+    returns WiresBlock from HLRAlgo;
 
     NbWires(me) returns Integer from Standard
     is static;