Refinement of action_type_check in viewAllNotifs.php, replacing indexed array with associative array, for easier reading.
Refinement of notifModal.js functions, and viewAllNotifs.php action_type_check;
addition of action_type_index, which passes result to notifModal.js as data-type,
which tells it whether a notification is a comment or not (and so whether to scroll to an ID).
Fixed bug in notifModal.js where it didn't differentiate between types of notifications;
Added recognition for comment notifications without an associated comment id;
Still need to fix issue where article doesn't scroll when comment notification is first in notif list;