Add ability to go backward by years via UIPicker. Added accumulator picker -- it finds the next month forward in time with the selected accumulator value. Populate the UIPicker with +/- 1209 values for each item. Change initialization of UIPicker for iPhone. Add ability to change the displayed date by tapping the cell for that date. This involved adding tag=1 for the label containing the day number. Also added tag=2 for the MM-DD value and tag=3 for textual information like holiday names. Trigger three-component UIPicker by tapping year, month, or acc.