Various requested fixes and updates.

Various requested fixes and updates.

Completed Attendee notifications and other minor fixes.
Fixed "Show Completed Only" on attendee list to work at all times and default to on.
Added request delete method to dataRegRequest that takes out related data
Added cron driven task to delete old reg requests and reg accounts
Better integration of notifications display to Evnet Registrations Dashboad
Added actual class ID pointer output in dataRegRequestRegistrant.php
Added custom field data for reg level to attendee edit
Changed registrant and account hold days to management fields.
Added "Not Attending" checkbox to atteendees list.
Added getRegTimeSimplified() to dataRegTime.php
Fixed Paging for Attendee list and added time selection to filter