*8540* Email JMs when studies released into unreleased Dataverse

Clean up notification handling. Email Dataverse-is-unreleased notification to JMs.
*8540* Email JMs when studies released into unreleased Dataverse

Clean up study-deleted notifcations.
*8540* Email JMs when studies released into unreleased Dataverse

Clean up file-deleted notifcations.
*8540* Email JMs when studies released into unreleased Dataverse

Clean up study-updated notifications
*8540* Email JMs when studies released into unreleased Dataverse

Clean up study-updated & file-added notifications.
Remove _sendNotification(), no longer needed