Fix items from Volker Englisch's review of the setup druid.

[David Hampton]

Log Message:
-----------
Fix items from Volker Englisch's review of the setup druid.  The
initial window now sets the "Setup" button as the default button.
Update the druid to fix problems with the tab focus.  Add some
clarifying text on how to restart gconf.  Update the script to restart
gconf for the user.

Tags:
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gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/bin:
        update-gnucash-gconf.in
    gnucash/src/gnome-utils:
        druid-gconf-setup.c
        druid-gconf-setup.glade