A number of bugs fixed in process model, but Omega update still not working properly, possibly because of failure of Langevin update algorithm.

Fixes/changes:
-introduced bugging capabilities
-fixed error in tau_eps update (Omega.pred only needed for current species)
-now calculating \eta=K\alpha instead of \eta=K(X_rw2 \beta_rw2 + \alpha).  This seems to resolve confounding b/w beta, beta_rw2
-fixed error in omega update (Cur.thin needed to have time indices)
-changed adapt algorithm to occur at the beginning of the MCMC chain instead of two separate runs