Improvements and fixes

A plant's production charts now fill the hours a remote-access outage left without data with expected production. The "Forecast" page now lists the hours of today and tomorrow with a negative day-ahead price.

• A plant's ticket list can now be filtered.
• A plant's networking page shows each device's type, address and online status.
• A contact's SEPA direct-debit mandate can now be signed from the contact's actions.
• A plant's component table now marks offline devices.
• A plant's day power chart now marks snow periods.
• Third-party components of the web app have received security updates.