Fix too specific rule for interpreting first line of CSV file.
Fix too specific rule for interpreting first line of CSV file.

We were requireing the length of the header row to match the next row in the file.
Now we expect that it will be the same or greater length.
[#106025918]

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap