gtk_entry and signals

[Arun Sharma <arun home com>]

gtk_entry seems to be missing the "activate" signal. As a user of
the widget, if I need to catch the "hit enter" event, it's either not
possible or inefficient.

I see that gzilla gets around this problem, by defining a "activator"
widget. But I think the code really belongs in gtk_entry.

If there is agreement on this issue, I can send a patch out. Can
someone tell me who I should be sending patches to ?

	-Arun