When plotting, extract the total trace from any sub-budgets

CE1 and CE2 now collect certain noises (thermal, Newtonian) into their own sub-budgets in __init__.py. plot.py now needs to check whether each trace is indeed a single trace or a collection of traces. If it is a collection of traces, it will take the total of the traces. This fixes #47 (closed).

gwinc/ifo/noises.py

@@ -33,7 +33,7 @@ class Newtonian(nb.Noise):
     """
     style = dict(
         label='Newtonian',
-        color='#15b01a'
+        color='#15b01a',
     )
 
     def calc(self):
@@ -46,7 +46,7 @@ class NewtonianRayleigh(nb.Noise):
     """
     style = dict(
         label='Newtonian (Rayleigh waves)',
-        color='#1b2431'
+        color='#1b2431',
     )
 
     def calc(self):