Improvements and fixes

Plants with horizontal irradiation sensors get expected production, and strings get performance ratios and panel counts on days with partial readings.

• If your plant measures irradiation horizontally instead of in the module plane, it now gets expected production figures too.
• Strings on a day whose data starts late now get a performance ratio, counted only over the hours with readings.
• Strings now get a panel count on days with readings only around midday, because the brightest readings count too.
• You can compare the panel count the analysis measured with the one you entered: the count you entered no longer overwrites it.