GSettings migration

[Rodrigo Moya <rodrigo gnome-db org>]

Hi

To start the GSettings migration, we needed a list of keys that we use
in both g-s-d and g-c-c, so I just went over the sources and made up
this list:

http://live.gnome.org/ControlCenter/GSettingsMigration

it's just a first try, so I'm probably missing some other applications
using some of those keys, so please complete the list.

To start with, I think we can start with the most obvious ones,
like /apps/g-s-d and /apps/g-c-c