Addition on C version of CFD-mini for comparison purposes (still serial)

For now I am adding a single c version of the CFD-mini benchmark. Next up will be naive parallel for both chapel and c.
Is this the right output for the C test?  I'm getting a mismatch which is making it appear that the problem size being used by the correctness test doesn't match this.  The first line of the diff is:

< nCell=8 nBox=2
---
> nCell=128 nBox=2