[wxPython] Updated calendar

I found a small bug in my calendar control.

It wasn't properly updating the dialog when the date values were set beyond
the current month.

The module is updated at the following location:

http://www.telusplanet.net/public/lwhite1/pymodules/calendar.py

I've also posted the up to date versions of all my contributions (with more
to come) at the following page.

http://www.telusplanet.net/public/lwhite1/wxmodules.htm

Enjoy

Lorne White