Report binning method in header.

rockit/camera/qhy/outputprocess.py

@@ -280,6 +280,7 @@ def output_process(process_queue, processing_framebuffer, processing_framebuffer
             ('CAM-PRES', round(frame['cooler_pressure'], 1),
              '[hPa] sensor pressure at end of exposure'),
             ('CAM-BIN', frame['binning'], '[px] binning factor'),
+            ('CAM-BMET', frame['binning_method'].upper(), 'binning method (SUM or MEAN)'),
             ('CAM-WIND', format_sensor_region(window_region), '[x1:x2,y1:y2] readout region (detector coords)'),
             image_region_header,
             bias_region_header,