MCMC running scripts (polychord)

Running scripts generated to produce MCMC. The jupyter notebook to generate them can be found at IST Euclid Gitlab (likelihood-mcmc-generator) Updated 19th April 2024: fixed bug in the definition of derived bgamma3 parameters for GCsp. Updated 2nd April 2024: updated polychord set up (higher number of nlives), added scripts for LCDM_gamma case, updated set-up for GCsp cases (purity parameter priors with 1% uncertainty, fixed counter terms, higher k_max)