Site VPN cards now show a traffic panel per tunnel

The plant's Site VPN cards now show a traffic panel per tunnel, with received and sent data on one scale and the connection state over it, following the page's time window. Up to three days shows a curve, up to ninety days a bar per day, and beyond that a bar per month.

• The Site VPN connection state is green while connected, red while down, bare where no reading was sent.
• The traffic panel tooltip names the exact instant and an outage's or no-data gap's start, end and duration.
• The traffic panel's day and month views carry the day's availability as a line.