Fixes a problem in kpilot where events that recur on a specific weekday each month (e.g., 3rd Thursday) were not synced properly.

This also fixes a problem where recurring events specified as a weekday from the end of the month (e.g., 2nd to the last Wednesday) are handled in a reasonable (though not entirely correct) fashion.

(The palm cannot handle events specified like this, so this patch attempts to convert the "from end of month" recurring event to a "from the beginning of month" event.)