Existing user messaging preferences should accomodate default settings and
permissions. This also includes some changes to default outputs preferences.
Signed-off-by: Ruslan Kabalin <ruslan.kabalin@luns.net.uk>
This introduces the new page where admin may change the permissions and
defaults for particular combination of message processors and providers.
Signed-off-by: Ruslan Kabalin <ruslan.kabalin@luns.net.uk>