[pylink] accept only dictionary from read_output.py.

examples/analytical_function/analytical_function.py

examples/analytical_function/test_analytical_function.py

examples/beam/read_Beam_Deflection.py

examples/ishigami/Ishigami.py

examples/pollution/pollution.py

src/bayesvalidrox/bayes_inference/mcmc.py

src/bayesvalidrox/pylink/pylink.py