suzerain: #3068 improve comment structure

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44275 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #3068 mimic perfect/driver.cpp

Required changing from scenario -> chdef, sg -> sgdef,
and permitting a variable number of fields when querying
the base flow definition.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44276 0bd85f0b-c151-43b9-a1e9-27231104551f