Improvements and fixes

A device a data logger lists but has never measured now appears among the plant's components. Where a Solar-Log logger's daily totals are unreadable, daily energy is recovered from the devices' own readings.

• A Solar-Log feed-in meter now appears in the plant's components even while it is still holding back its energy readings.
• The single alert for components that stopped producing now arrives after 30 minutes instead of an hour.