Improvements and fixes

The battery dashboard now breaks energy down per component. The yield-report export no longer errors, and the report editor gains undo and redo.

• The battery dashboard now shows each component's charged and discharged energy by day or month, with an AC/DC switch.
• A plant's core data dialog now offers a fillable inverter AC peak.
• The yield-report export no longer returns an error for templates that read individual measurements.
• The report editor now has undo and redo, kept across a page reload.
• The report editor's reports list now sorts by latest activity.