Notify Tweaks

Bunch of small things for notify

1) added an admin panel under feature / options ... right now with one setting, on / off ... I think there will be more at some point, if not then we can drop the panel and stuff the checkbox on one of the other pages

2) combined a couple of the functions that changed the notif_status flag the function name is not as descriptive but easier to add to in the future I think

3) doc block adds / tweaks because we all love those doc blocks, really we do!

4) added the ability to mark read/unread/remove to the notification list .. right now its one at a time, may need to add batch processing to that, so if someone wants to :)