[kronolith] Calendar Recurrence

[Chuck Hagenbuch]

Quoting Hans-Dominik Mueller <hdm at hdm-online.com>:

> are there any possibility's to get Recurrences like
> on every '1st or 2nd or Last' '...day' of Month or '2' days before end
> of month.
>
> if its possible with some coding, please let me know where to start best.

New recurrence types would need to be added to  
framework/Date/Date/Recurrence.php, then merged to Kronolith and added  
to the UI.

-chuck