Python script that cleans FAA airmen files

[jayohday]

This Python script goes through all necessary and applicable data-cleaning steps for inclusion in The Accountability Project. This Python script produces a file similar to, but not exactly the same as, the airmen files previously produced for TAP. This file contains a few different fields created out of raw data fields:

1. uszip5 - the 5-digit US ZIP created out of the 9-digit ZIP
2. nonuszip - a field for all non-US ZIP codes
3. Fields for each the month, date and year (where applicable) from any and all date fields.

This script also combines the PILOT_BASIC.csv and NONPILOT_BASIC.csv files.

There are two other airmen files included in the .zip file downloaded from the FAA — they are NONPILOT_CERT.csv and PILOT_CERT.csv — those files are not currently included in this script, but O'Dea can add them next week. The file on TAP right now seems to only include data from the _BASIC files, but the UNIQUEID field should allow for joining of all four files, if we want that.