Ticket 38: timespin badly displayed on GTK

Hi,

Here is a patch to fix two things:
 * Fix timespin on GTK so that it displays the complete widget.
 * Fix the display of the time when the user choose a date in the
   Role/User dialog (should be 00:00:00, and not an empty string).

Comments?

I suppose I have some sort of bugfixes week :) I'll commit all the
bugfixes I did tomorrow night if no-one objects.


--
Guillaume.
 http://www.postgresqlfr.org
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