Show available values when erroring out during YAML parsing

[victorapm]

For example:

------------------------------------------------------------------------------------
solver: 
  fgmres: 
    max_iter: 500
    krylov_dim: 500
    print_level: 0
    relative_tol: 1.0e-6
preconditioner: 
  mgr: 
    level: 
      0: 
        f_dofs: [0, 1]
        f_relaxation: h-ssor <-- * INVALID VALUE *
        g_relaxation: none
        restriction_type: injection
        prolongation_type: jacobi
        coarse_level_type: rap
    coarsest_level: amg
------------------------------------------------------------------------------------
====================================================================================
                                HYPREDRIVE Failure!!!
====================================================================================

Error details:
  --> Found 1 invalid value!

====================================================================================

Proposed:

Error details:
  --> Found 1 invalid value!
  --> Available values for "f_relaxation": "none", "single", "jacobi", "v(1,0)", "amg", "chebyshev", "ilu", "ge", "spdirect", "ge-piv", "ge-inv"