Belatedly added ISC license
Add comments on how the code works.
Update docs, get rid of SF3.
Update summary levels; remove one of the ZCTA types, and the nation/region types.
Recode geographic header.
Refactor geographic header (geo_lines) function for 2010 geographic header.
Much refactoring for 2010 census.
Read csv for fields
csv of 2010 data field descriptors
Remove 2000 files, rename 2010 file.
Seems to be working.
Set width of matrix subset to be 4.
Don't print url to stdout.
Add option to get a specific county.
No longer assume that all files have all rows and are in exactly the same order.
Fix bug with matrices with >= 10 columns
Updated field offsets.
Allow county option to be omitted.
Handle --state in a halfway-reasonable way since there are no national-level files anymore.