Class wrapper for pions.
Wrapper for pion correlators.
Preparing mixed pion correlators.
Extract timeslice from HISQ propagator.
Consistency check.
Reorganized the HISQ and overlap propagators.

Added spin degrees of freedom to HISQ and made first attempt
at multiplying in the Omega factors.
Brought HISQ and overlap data into the same structural form.
main() checked the consistency of reorganized and original data.