Improvements and fixes

Larger transfers over VPN no longer stall, recent connections show length, location, IP and data used, and saved networking changes tell you what follows.

• The VPN configuration file you download is named after your email address and no longer lets larger transfers to devices at a plant stall.
• Your "Recent connections" list now shows each connection's length, location, IP address and data used, next to its start time.
• If you delete your VPN certificate, your earlier connections stay in the list, and a new certificate keeps them.
• After you save a change on a plant's "Networking" page, you are told the on-site agent is applying it and will restart shortly.
• Your sessions and API tokens now name the browser or tool that last used them, or say "Unknown client".