Improvements and fixes

Grid meter readings taken through a Phoenix Contact controller no longer arrive with the feed-in direction reversed.

• A Phoenix Contact controller now works out by itself which direction the grid meter counts, and shows no grid values until it is sure.
• "Grid sign convention" in the controller's settings sets the direction by hand when the automatic check cannot decide.
• Settlement events now also carry the lost energy worked out by the flat-rate (pauschal) method, beside the figures from each irradiation source.
• Curtailments back to January 2025 are now settled, the reference day for months before July 2026 being the last suitable day before the curtailment.
• A settlement event now names an irradiation source left out and why, and a morning gap in its readings no longer leaves the afternoon unsettled.
• Expected production now follows each string's own orientation and size when the plant's components state them all, instead of one plant-wide orientation.