What's New Digest 5.1.0

This XenForo 2.0 addon sends a daily or weekly email to users with a list of top new threads and top updated threads. ( XF v2.0.6 minimum )
update helper_account template modification to work with both XF2.3 and earlier versions

• listen for sparkpostmail_non_transactional_stop_map event and use the whatsnewdigest email stopper

• tweak unsubscribe confirmation message

• separate out getMail function so we can over-ride it and add functionality