This function otimises parameter selection so that the model will ultimately converge.
param_select(theta, lb, ub, model, temp, obs, seed, restarts = 300)
vector of starting values for each parameter
vector of lower bounds on each parameter
vector of upper bounds on each parameter
mathematical function to be applied
temperature values
DTG mass values
random seed for optimiser
number of times for optimiser to restart
optimised starting parameter values