Inlcudes new ERG oil and gas surrogates provided in November 2018
Surrogates were provided as 4km with no gapfilling
Gapfilling was performed with Surrogate Tool case 2016beta_oilgas_4km
Aggregating to 36km was performed with /work/EMIS/tools/surgtool/cases/2016beta_oilgas_4km/out/CONUS4k/profiles/surgtool_for_aggregating.csh

All other USA and MEX surrogates, including updated onroad surrogates, are from ../CONUS36_2014_29Aug2018

Canada surrogates are from the Env Canada data release for 2015, received in November 2018
Surrogates were processed with Surrogate Tool case Canada_2015
