Rename "carbon accounting data"

[grgmiller]

Currently, all of our consumed emissions factor data is labeled as "carbon accounting data". While carbon accounting is one important use of this data, it has broader uses as well, so I propose that we consider relabeling these data.

Reasoning:

• These data include not only CO2 rates, but other GHGs plus NOx and SO2
• Another academic use of the data is in attributional lifecycle assessment studies
• Really these data are useful whenever you are trying to attribute some share of power system emissions to an end user of electricity

Other proposed names:

• Emissions factors for consumed electricity
• Emissions accounting data
• Scope 2 accounting data

At the very least, we may want to update the description on the data download page to highlight these other uses.