removed last Nio occurrences, changed sampling_strategy dataset name to have no spaces

da/ct/obs.py

@@ -239,7 +239,7 @@ class CtObservations(Observation):
 
         savedict                = io.std_savedict.copy() 
         savedict['dtype']       = "int"
-        savedict['name']        = "sampling strategy"
+        savedict['name']        = "sampling_strategy"
         savedict['units']       = "NA"
         savedict['dims']        = dimid
         savedict['values']      = data.tolist()