suzerain: #2442 avoid Eigen::IOFormat

Turns out IOFormat with OpenMP tickles an Intel 12.1 bug.
Moreover, uses fullprec for more consistency with other output.
Also, wildly more understandable than the Eigen stuff.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43762 0bd85f0b-c151-43b9-a1e9-27231104551f