Adjust for discontinued 080 summary level

[JoeGermuska]

This tool was able to be more efficient and accurate by using the 080 summary level to identify tracts that are in a specific place, and to only count the fraction of a tract that is in that place. (Place boundaries can divide tracts.)

Beginning with 2013, ACS discontinued 080 tabulations. This means there's no way from ACS Census data to identify tracts that are in a specific place. It should be feasible to only select data for the tracts that are in the xref, which would address the efficiency issue. There's probably no good way to deal with the possibility that a substantial portion of the tract in the xref is outside the place in question.