Bug fixes in holidays and added Swedish holidays
Added Swedish holidays
In order to support Swedish holidays there is the special calculation of Midsummer Day (Saturday between 20 and 26 June). This is required to compute the Midsummer Eve (the day before) in case it is a holiday.
Fixed SubstituteHoliday setting
The SubstituteHoliday setting in HolidayParameters was not working correctly because of a regression introduced in a previous update. For example, this was affecting AU holidays.