0027192: Improvement of storage of Ocaf document in XML file format

Improvement of code in XmlMDataStd_ExtStringArrayDriver.cxx

Corrected test-script

src/DDataStd/DDataStd_BasicCommands.cxx

@@ -1153,7 +1153,7 @@ static Standard_Integer DDataStd_GetExtStringArrayValue (Draw_Interpretor& di,
     return 1;
   } else {
     const TCollection_ExtendedString& value = A->Value(index);
-    di << value << "\n";
+    di << value ;
   }
 
   return 0;