previousDayHoliday():
Check if previous day was a holiday. Check is done relative to
computed endtime.
isHoliday():
Check if startDateTime is on a holiday.
getPaymentOptionIndex():
Compute the index of the payment-options-section inside a tariff-file.
This is done as workaround (and backward compatibility).
parseWeekDay():
Parse new structure of tariff-file.
Gerhard Hoffmann
bda8914f1a