2) additionaly added new year of the next year and new year's eve of the last year to this years holidays, as they are often displayed (or missing) in a week- or day-view
3) fixed the not working saving of a changed observance rule in the holiday manager
4) added the observance rule to new year in the US
- holidays not complying to a (simple) rule like Eastern can now be entered as a one-time holiday for a fixed year
- fixed some wrong links and other stuff in the UI
- added a error-msg to accept_holiday on phpgroupware.org if there is already a file for the locale
- added download for holiday-files