suzerain: exclude-path /bar_p from gold

Done in anticipation of it changing next, and me
not wanting to update gold files.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43656 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2736 remove derived bar_p

bar_p will appear in the next commit, so remove the
derived version.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43657 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2736 explicitly sample bar_p

Yikes, quite a lot of messing around to make this the two-line
change it always should have been.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43658 0bd85f0b-c151-43b9-a1e9-27231104551f