suzerain: clean up B-spline save/load/create

Renaming TODOs done + updates to match in other locations
Wrapping the load method's desired for gop more cleanly

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43678 0bd85f0b-c151-43b9-a1e9-27231104551f