[PA-A] update main scripts.

BayesValidRox/tests/PA-A/Benchmark_PAA.py

BayesValidRox/tests/PA-A/extractpointdataovertime.py

BayesValidRox/tests/PA-A/ffpm_validation_stokesdarcy.py

BayesValidRox/tests/PA-A/ffpm_validation_stokespnm.py

BayesValidRox/tests/PA-A/read_ffpm.py

BayesValidRox/tests/PA-A/ref_stokespnm.py

BayesValidRox/tests/PA-A/util/post_plot_PAPER.py

BayesValidRox/tests/PA-A/util/vel_diagnostics.py