Overview improvements

[gtandersen]

Is your feature request related to a problem? Please describe. Information overflow is ubiquitous in email communication, indicated by the Inbox and other folders containing more messages than can be efficiently processed.

The Overview (https://runbox.com/app/overview) aims to solve this problem but should be more user-friendly, more accurate, include more information, and be improved in order to manage this by adding statistics/analytics based on the email corpus.

Describe the solution you'd like

• [x] Increase available time spans to include last year.
• [ ] Show message timestamps for each message entry.
• [ ] Only messages that are received via mailing lists should be shown in the "From mailing lists" tab.
• [ ] Number of messages per sender, and then number of identical subjects (or words) per sender.
• [ ] Visualize importance of senders with diagram (bar chart) indicating the number of messages per sender.
• [ ] Number of senders per domain name with diagram (pie chart).