Reduce columns produced by the script

[moneypro]

Ignore the columns that don't affect the matching, and is not updated to avoid future conflicts.

[moneypro]

Done. Now it gives a simplifed version. It might be handy to give an alternate version that produces a more detailed output. (say, -v, -vv?)
-v gives student netid and student names.
-vv gives every lab grades
-vvv gives everything in the previous csv