Sampling rate is saved in HDF files as attributes, i.e. h.root.data_pool.dict_result._v_attrs["sampling_rate"]

Fixes T95

src/data/ADC_Result.py

@@ -232,6 +232,7 @@ class ADC_Result(Resultable, Drawable, DamarisFFT, Signalpath):
                 if self.description is not None:
                     for (key,value) in self.description.iteritems():
                         accu_group._v_attrs.__setattr__("description_"+key,str(value))
+                accu_group._v_attrs.__setattr__("sampling_rate",self.sampling_rate)
 
                 # save interval information
                 filter=None

src/data/Accumulation.py

@@ -428,7 +428,7 @@ class Accumulation(Errorable, Drawable, DamarisFFT, Signalpath):
                 if self.common_descriptions is not None:
                     for (key,value) in self.common_descriptions.iteritems():
                         accu_group._v_attrs.__setattr__("description_"+key,str(value))
-
+                accu_group._v_attrs.__setattr__("sampling_rate",self.sampling_rate)
                 # save interval information
                 filter=None
                 if complib is not None: