Create an NS MCMC object for testing
upper bound to the length of the MCMC chain
number of states the MCMC will process
before the posterior's state will be saved to file.
Use -1 or
NA to use the default frequency.
number of burn in samples taken before entering the main loop
number of initialization attempts before failing
number of particles
as created by create_tracelog
as created by create_screenlog
as created by create_treelog
an MCMC object
create_ns_mcmc to create a default
nested sampling MCMC