suzerain: #2736 add component prefix

Want to stuff "bar_" onto the front of these.  Amend
the generation macro to do that automatically.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43650 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2736 use SAMPLES_COMPONENTS(bar_)

Eliminates most of the synchronization issue present between
suzerain::samples and perfect_{mean,summary}.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43651 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: add COMPONENTS_FOR_EACH

I want this nested iteration in at least two places,
so write it once here.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43652 0bd85f0b-c151-43b9-a1e9-27231104551f