This adds a new precision macro, WFSYM, which is only used in WriteParameterFile. This ensures that these parameters will always be written to disk with full double precision.
The original rationale was to avoid having a gamma very close to unity (1.000001) being rounded to 1 in the old version of WriteParameterFile.
UPDATE: Reverting, moving just Gamma to GOUTSYM.
Hi Nathan, do you know if this is different from GOUTSYM?