Perform table 1 lookup code substitutions

[waldoj]

There is a lot of shorthand data scattered throughout the files, and those fields are assigned a table_code value within the YAML. They can be looked up within 1_tables.csv and resolved. Seems like we ought to be performing that resolution. Perform the following steps:

• [x] Read the contents of 1_tables.csv into a dictionary
• [ ] For any field for which we have a table_code value, replace the provided value with the translated value

Make sure that this transformation is performed within the transformation stanza, so that anybody who wants the raw data can have it.

[waldoj]

I think the problem here is that each new dictionary entry has the same implied key (of nothing), so each .update overwrites the prior. I need to learn what unique element, if any, is supposed to be used to define each dictionary entry. Maybe increment an integer? I'm not sure.

[waldoj]

Ah-ha. I didn't want a dictionary. I wanted a list, which in turn contains dictionaries. (Like an array of objects, in PHP.)