Improvements and fixes

The "Recent connections" list on the profile page now shows more about each of the account's own VPN connections.

• The "Recent connections" list now shows each connection's length, location, IP address and data used, next to its start time.
• Deleting a VPN certificate no longer clears earlier connections, and a new certificate keeps them too.
• The downloaded VPN configuration file is now named after the account's email address instead of a code.