code: public static void setEncoding (@Nonnull final Marshaller aMarshaller, @Nullable final Charset aEncoding)
    {
      setEncoding (aMarshaller, aEncoding == null ? null : aEncoding.name ());
    }
docs: Set the standard property for the encoding charset.
  
  @param aMarshaller
  The marshaller to set the property. May not be <code>null</code>.
  @param aEncoding
  the value to be set