Consider checking etr_band value to see if it is like "ETo" and/or not like "ETr"

[cgmorton]

It seems like it would be a good idea to check that the etr_band value is not set to "ETr" (instead of "ETo") for SIMS. This gets a little tricky since it is difficult to know all the possible band names that could be used. At a minimum we should probably check that it isn't one of the known ETr band names (checking exactly for "ETr_ASCE" in CIMIS and "etr" for gridmet).