Review diverging dataset source paths

[ezwelty]

When attempting to merge source attributes spread out across src/pudl/package_data/meta/datapackage.json, pudl.constants.data_source_info and pudl.constants.base_data_urls, I found some differences in the path attribute. I can't find any reason why they would differ.

Unless there is a good reason to have multiple paths for a source, we need to choose one path from the options for each source below:

source	path (datapackage.json)	path (constants.data_source_info)
mhsa	https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp	https://www.msha.gov/mine-data-retrieval-system
ferceqr	ftp://eqrdownload.ferc.gov/DownloadRepositoryProd/BulkNew/CSV	https://www.ferc.gov/industries-data/electric/power-sales-and-markets/electric-quarterly-reports-eqr
ferc1	ftp://eforms1.ferc.gov/f1allyears	https://www.ferc.gov/industries-data/electric/general-information/electric-industry-forms/form-1-electric-utility-annual
epacems	ftp://newftp.epa.gov/dmdnload/emissions/hourly/monthly	https://ampd.epa.gov/ampd

Note that this is after fixing some of the path in src/pudl/package_data/meta/datapackage.json as follows:

• eia861: https://www.eia.gov/electricity/data/eia861/zip (forbidden) to https://www.eia.gov/electricity/data/eia861
• msha: https://arlweb.msha.gov/OpenGovernmentData/DataSets (forbidden) to https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp
• epaipm: https://www.epa.gov/sites/production/files/2019-03 (not found) to https://www.epa.gov/sites/production/files/2019-03/documents/chapter_1.pdf
• ferc714: https://www.ferc.gov/docs-filing/forms/form-714/data (not found) to https://www.ferc.gov/industries-data/electric/general-information/electric-industry-forms/form-no-714-annual-electric

[zaneselvans]

In all of these cases we're looking for a path to a human readable "source" of the data right -- not the raw downloads. Both FERC and MSHA have overhauled their sites in the last year, and the old URLs no longer work, even though the raw data download location is the same in many cases. I would say...

• msha: https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp
• ferc1: https://www.ferc.gov/industries-data/electric/general-information/electric-industry-forms/form-1-electric-utility-annual
• ferceqr: https://www.ferc.gov/industries-data/electric/power-sales-and-markets/electric-quarterly-reports-eqr
• ferc714: https://www.ferc.gov/industries-data/electric/general-information/electric-industry-forms/form-no-714-annual-electric
• epacems: https://ampd.epa.gov/ampd
• eia861: https://www.eia.gov/electricity/data/eia861

[ezwelty]

@zaneselvans Thanks for the quick response. I agree that human readable is the right choice. I'll implement your choices.

[cmgosnell]

i believe this is implemented in #806