Proof of concept for setting dismissed field for notifications table, to mark a notification that's already been viewed.
Intermediate commmit for proof of concept;
disables normal functioning of notif modal, but demonstrates setting of dismissed field for notification table;
next step is combining the two.
Added file notifDismiss.php as a require_once call -- for notifArticle, userCard, etc. Just append the notif_id to the url as a query.