Merge branch 'lukas_issue231_feat_add-number-of-stations-to-station-map-legend' into 'develop'

Resolve "Add number of stations to Station Map legend"

See merge request toar/mlair!211

mlair/plotting/postprocessing_plotting.py

@@ -292,7 +292,7 @@ class PlotStationMap(AbstractPlotClass):
                 mfc = plot_opts.get("mfc", default_colors.get(name, "b"))
                 legend_elements.append(
                     mlines.Line2D([], [], mfc=mfc, mec=mec, marker=self._adjust_marker(marker), ms=ms, linestyle='None',
-                                  label=name))
+                                  label=f"{name} ({len(data_collection)})"))
                 for station in data_collection:
                     coords = station.get_coordinates()
                     IDx, IDy = coords["lon"], coords["lat"]