This is the patch, that adds full timezone support to
roundup. Especially DST handling.

However please note, that this patch introduces
additional dependency on pytz
(http://pytz.sourceforge.net/) and datetime python module.

Timezones in the configuration file and user profiles
can be specified using hour offset or timezone names
(e.g. UTC, America/New_York, Europe/Warsaw, etc.).

(the calculations in roundup.date are a little messy)

my email is: jkoszuk(at)poee(dot)eu(dot)org

I hope it will be useful,
Jarek Koszuk