Roadmap iCalendar tasks lack due date.

[Alex Johnson]

When an iCalendar is generated by roadmap.py it looks like it's trying to put the due date of the milestone as the due date of the tasks within that milestone — very nice! But, it never actually puts the due date in there because lines 258-260 are:

                if milestone.has_key('date'):
                    write_prop('RELATED-TO', uid)
                    write_date('DUE', localtime(milestone['due']))

This change (line 258: date ⇒ due) makes it work correctly:

                if milestone.has_key('due'):
                    write_prop('RELATED-TO', uid)
                    write_date('DUE', localtime(milestone['due']))

[cmlenz]

Fixed in [2887] and [2888]. Thanks!