code: protected static final boolean isValid (final Holiday aHoliday, final int nYear)
    {
      return _isValidInYear (aHoliday, nYear) && _isValidForCycle (aHoliday, nYear);
    }
docs: Evaluates if the provided <code>Holiday</code> instance is valid for the
  provided year.
  
  @param aHoliday
  The holiday configuration entry to validate
  @param nYear
  The year to validate against.
  @return is valid for the year.