Revert "smurf: Add phase correction coefficients to pipeline output"

- Unwittingly modified smf.h directly, not knowing it is generated from smf.h.source

This reverts commit f8e11f09776746b731409132063cbcca0c836de9.
smurf: Add phase correction coefficients to pipeline output *Revised*

- Revised to modify smf.h.source instead of changing smf.h directly
- Add smf_fit_poly1d_chisq wrapper around internal function to return rchisq
- Output phase fit coefficients DC Offset, slope and chi^2 during phase correction