Sapwood allometry house cleaning

This release does not add new features, but mostly does house-cleaning for sapwood allometry. The updates include an update to the parameter latosa_int and latosa_slp, to be inverted and more verbose: sa_per_la_int and sa_per_la_slp. Also, the slope term was updated to respond to increases in height (not diameter). A sapwood area was also output from the function, to aid in hydraulics calculations.
Updates to the parameter file require updates to the default parameter files in E3SM and CTSM used in testing (hence the minor API change).