GtkCalendar signals

[Dave Camp <campd OIT EDU>]

Whenever the day being referenced by a calendar widget changes, wether
by changing the year or month with the arrows or by clicking a day, a
day_selected signal is emitted.

If the date is changed with the arrows, a *_prev or *_next signal is
emitted before the day_selected signal is emitted.  However, only one
signal (the day_selected signal) is emitted if the days are clicked.  

Would it be ok to add a new signal (date_clicked or something), emitted
before the day_selected signal, that would be emitted when a day was
clicked?  It doesn't seem like this would break any existing code, as
the day_selected signal would still be emitted, and it would bring a bit
more consitency to the widget.

Later,
- Dave Camp