[AndyB] Auto delete direct messages 1.0

Auto deletes direct messages by date.

(Example of Options page)






Questions and Answers:

Q: How are direct messages selected?
A: In the Options page by default any direct message which has a last message date older than 365 days will be selected for deletion.

Q: When are direct messages deleted?
A: This add-on runs a Cron entry on the first day of the month.