one_time_step: One update of MH chain
In liesb/BIITE: Bayesian Immunogenicity Inference Tool for ELISpot

Performs one time step in the MH chain:

1	one_time_step(h, loglik_h, eli.dat, pep, mol.names, unif.prop, radius, p.df)

`h`	Hypothesis which is the current state of the chain
`loglik_h`	Log likelihood of h
`eli.dat`	ELISpot dataset
`pep`	Peptide currently being processed
`mol.names`	Names of the HLA molecules in the ELISpot dataset
`unif.prop`	If TRUE, choose proposal state from [0,1]^m
`radius`	If unif.prop is FALSE, we look for a proposal state in a hypercube around h restricted by radius
`p.df`	Dataframe which describes the parameters of the prior distributions for each HLA