Four date/time columns preserved after clean_raw_data()

[mackerman44]

This one has perhaps been resolved. Maybe we just need to re-run clean_raw_data() and determine if it functions as intended, now.

@mackerman44 April 13, 2020:
When running the clean_raw_data() function on the "raw" data, multiple date and/or time columns are generated and afterwards we end up with 4 columns (orig_date, date, time, and date_time). Those columns are also preserved through round_tag_codes().

Are those columns duplicative i.e. can we only bring the date_time column through clean_raw_data()? Or is there a reason for keeping additional columns?

@KevinSee April 14, 2020:
The org_date was left to identify which rows had an original date-stamp of "00/00/00", for QA/QC purposes, or in case we realized that assigning a date for those observations based on the file name was not a good idea. If we're settled on how that works, we could remove orig_date, date and time columns from the data when it's run through clean_raw_data().

@mackerman44 April 14, 2020:
That makes sense to me. But maybe leave the orig_date, date, and time columns for now until we're further along in the build process? But also keep this issue open to remind ourselves later to remove?