Use sep instead of delim_whitespace

delim_whitespace is to be deprecated in pandas.read_csv. Fortunately they provide a drop-in replacement for its functionality: providing a RegEx for wihtespace as the sep argument. This change does that in the one place in the code where delim_whitespace is used.

tools/RAiDER/gnss/downloadGNSSDelays.py

@@ -74,7 +74,7 @@ def get_stats_by_llh(llhBox=None, baseURL=_UNR_URL):
 
     stations = pd.read_csv(
         stationHoldings,
-        delim_whitespace=True,
+        sep='\s+',
         names=['ID', 'Lat', 'Lon', 'Hgt_m']
     )
     stations = filterToBBox(stations, llhBox)