Handling of non-standard NWIS data

Since a lot of our examples and testing rely on downloading data from NWIS using dataretrieval, we are likely to run into some issues with non-standard naming of the discharge parameter. For instance, streamgage 01432000 with having 00060_2_Mean instead of just 00060_Mean. Other sites sometimes have 00060_discontinued or 00060_upstream of dam instead of 00060. It may be useful to have a utility function in hyswap that cleans NWIS data? Or maintain a list of sites to exclude?