code: public static void log (@Nonnull final Logger aLogger,
                            @Nonnull final IErrorLevel aErrorLevel,
                            @Nonnull final String sMsg)
    {
      log (aLogger, aErrorLevel, sMsg, null);
    }
docs: Generically log something
  
  @param aLogger
  Logger to use. May not be <code>null</code>.
  @param aErrorLevel
  Error level to use. May not be <code>null</code>.
  @param sMsg
  The message to log. May not be <code>null</code>.