All samplers appear to be working now (including OPRS).  Since last commit, the following changes were made:

-Fixed a bug w simulated data & setup for RS models in kernel formulation (distance categories >3.7 set to NA)

-changed S-T simulations to use a space-time covariate process where modeling occurs on the real scale.  After simulation, each time step's cov values are divided b their max to give an upper bound of 1.0, and values <0.0 are fixed to 0.  This should give better contrast in covariate values.

-Fixed a bug in MCMC_OPRS where Control $MH.omega was being used in place of Control$MH.Z

-Fixed a bug in MCMC_OPRS where sigma^2/2 wasn't included in drift term for LH

-Fixed bug in MCMC_OPRS where data frame for first time (X.pred.list[[1]]) referenced Data$Grid[[it]] instead of Data$Grid[[1]]

-Fixed bug in MCMC_OPRS: a '-' sign had been ommitted from full conditional for beta

-Fixed bug in MCMC_AST, where n.obs was used to define size of X.no.obs instead of n.no