0023523: In session DRAW it is impossible to close document having name already once closed document.

Added destructor for TDocStd_Document which performs destruction of document in logical order in order to avoid exception when Undo and Redo fields are destructed after THF_Data field.
Added removing name of closed document from tcl variables in the DRAW in order to avoid exception during use the same name for new document.
Modification to avoid compilation error class ViewerTest
Minor correction in test caf basic G3

src/CDM/CDM_Document.cdl

@@ -68,9 +68,10 @@ is
 
     Initialize;
      
-    Destroy(me: mutable) is protected;
-    ---C++: alias ~
 ---Category: virtual methods
+    Destroy(me: mutable) is virtual protected;
+    ---C++: alias ~
+    
 
     Update(me: mutable; aToDocument: Document from CDM; aReferenceIdentifier: Integer from Standard; aModifContext: Address from Standard)
     ---Purpose: The Update  method  will be called  once  for each