Add more reporting options in dashboard | Add option to group top senders

[jstebenne]

Some senders are using plus adressing and/or different emails to send messages.

In the case of plus adressing, I believe this should be automatically handled to exclude the string after the +.

However, in the case I have below where Facebook is using a notification and update address, I think a user should be able to configure if they want to group by sender name or address

In general, I would love to see more stats, but what we have here is a great starting point!