set the figure width to the summed widths of the plots

plot0d.py

@@ -10,7 +10,8 @@ class Plot0D:
     def __init__(self):
         self.timeseries = timeseries = TimeSeries()
         self.histo = histo = Histo()
-        self.fig = row(timeseries.fig, histo.fig)
+        width = timeseries.fig.width + histo.fig.width #TODO: if not set, width is None
+        self.fig = row(timeseries.fig, histo.fig, width=width)
 
     def set(self, times, values):
         self.timeseries.set(times, values)