This is done via another preference in the settings screen
and an action button attached to the notification itself

This is just a first rough implementation.
A real UI designer should look over this.

* Add setting to show notification on the lockscreen
* Don't block notifications in the contact-/-group/-forum/-bloglist

Signed-off-by: goapunk <noobie@goapunks.net>

Signed-off-by: goapunk <noobie@goapunks.net>

Also fixed a bug with settings namespaces.