Code cleanup in default-applications capplet

I’ve just committed a patch to the default-applications capplet that converts it to use GConfPropertyEditor. This removes a lot of duplicated code within default-applications:

$ svn diff -rPREV gnome-da-capplet.c | diffstat
gnome-da-capplet.c | 1029 ++++++++++++++---------------------------------------
1 file changed, 277 insertions(+), 752 deletions(-)


If anyone is currently running gnome-control-center from SVN, I would appreciate any extra testing on the default-applications capplet to ensure than no unexpected behaviour has been introduced.