Improvements and fixes

The web page of a device that answers only over HTTPS opens again. Alerts that a feed-in meter's or an irradiation sensor's energy had to be estimated are sent again.

• The web page of a device that answers only over HTTPS opens again instead of looping, and it is no longer noted as plain HTTP.
• A device just found in a scan opens its web page straight away, instead of answering with an error until a later scan.