#200 Allow choosing the eigen solver for some stress criteria in the `StandardElastoviscoPlascity` brick

[Helfer Thomas]

The Hosford1972 and Barlat2004 now has an eigen_solver option.

@Brick StandardElastoViscoPlasticity{
  stress_potential : "Hooke" {young_modulus : 150e9, poisson_ratio : 0.3},
  inelastic_flow : "Plastic" {
    criterion : "Hosford1972" {a : 100, eigen_solver : "Jacobi"},
    isotropic_hardening : "Linear" {R0 : 150e6}
  }
};