Now writing out particles and pred prior. Eigen bug?

While running ABC with the dice game, it crashed when filtering particles
around SMC iteration 7 or 8.  This may be because it converged and some
linear algebra operation became undefined.  Might not ever be encountered
when simulating real data.  Seems to be related to calculating eigenvectors.

Error message:

abc_mpi: /home1/01856/thladish/eigen/Eigen/src/Eigenvalues/EigenSolver.h:579:
void Eigen::EigenSolver<_MatrixType>::doComputeEigenvectors() [with _MatrixType
= Eigen::Matrix<long double, -1, -1, 0, -1, -1>]: Assertion `0 && "Internal
bug in EigenSolver"' failed.