Added an attribute (reflect="upper", reflect="lower" or reflect="both") to RandomWalkOperator to allow reflection at boundaries.
Added an attribute (reflect="upper", reflect="lower" or reflect="both") to RandomWalkOperator to allow reflection at boundaries.

benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc