Write transform function to clean and normalize FERC 714 XBRL respondent ID table

[aesharpe]

Tasks

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1. ensure no sructural changes in new and old data
2. do id's change year-to-year?
3. are there new id's that are different than the old ids?
4. fix any baddies

[zaneselvans]

One thing I've noticed looking at the old and new data for this table, is that the XBRL derived data looks like a combination of 2 tables in the DBF/CSV data, and some of the additional data might be helpful for doing record linkage. So we might want to look at bringing in the 2nd identification / certification data table from the DBF data, which would allow better continuity between the XBRL & CSV data.