Mail transport setting in notification.ini surely needs refactoring

Firstly default setting points to non-existing transport

[TransportSettings]
DefaultTransport=mail

instead of

[TransportSettings]
DefaultTransport=ezmail

Also all kernel code directly specifies used transport,

$transport = eZNotificationTransport::instance( 'ezmail' );

instead of

$transport = eZNotificationTransport::instance();

which make 'DefaultTransport' setting useless.

/kernel/classes/notification/handler/ezcollaborationnotification/ezcollaborationnotificationhandler.php
/kernel/classes/notification/handler/ezgeneraldigest/ezgeneraldigesthandler.php
/kernel/classes/notification/handler/ezsubtree/ezsubtreehandler.php