1.0-1 (29 March 2009)
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added bkrate in order to compensate for the high
negative correlation in the MCMC for b and k

minor modification necessary to fully incorporate
a new epipstep function (other than the epistep
provided) and to make a comparison showing the 
advantage of adaptive mangement over the optimal
fixed strategy when the true model lies outside the
class of SIR models considered in the framework