Updating county-group identifiers

[IoannisPapadakis]

In etlCz.do I see you rename cntygp97 and cntygp98. I think in the IPUMS data I have cty_grp70 and ctyprp1980 -- is there a reason for the difference?

PS_1: I think that I was misled from the list of variables you suggest to download. You have cntygrp97 while you should have cntygp97.

PS_2: I was also confused because here you use cntygp* while you propably want to rename cty_grp70 and ctygrp1980 that you find in Dorn's crosswalks. Initially, I thought that this was due to changes in IPUMS data but It is clear now that it is due to changes in Dorns' crosswalks.