Identify and replace all "OTH" energy source codes about open-grid-emissions HOT 2 CLOSED

We have implemented a fix using a manual update table, but if we wanted to programmatically assign these fuel codes, we could compare the reported fuel_mmbtu_per_unit value for the other fuel to the distribution of these heat contents of known fuels to see which it is the most similar to. When it comes time to implement this, there is some code started in notebooks/programatically_update_OTH_fuel_codes.ipynb

from open-grid-emissions.

In #131, we have implemented the following:

• Whenever we assign an energy source code to a plant or generator, and the assigned code is "OTH", we now manually update this fuel code to be an actual fuel code. Leaving the fuel code as OTH meant that the code was calculating the emissions for this fuel as zero, since there is not an emission factor for OTH.
• We created a manual table called updated_oth_energy_source_codes which maps these fuel types. We manually identified these by examining the heat content of the OTH fuel and comparing it to the heat content of other named fuels. In certain cases, the plant name also provided some clues (e.g. if the generator was located at an oil refinery, or a paper mill).

from open-grid-emissions.