v2.1.0
* renamed `jags_discrepancies` as `predictive_check` and now
returns coef table and can be used for multiple discrepancy measures
* now use `derived_code`, `modify_data_derived` and `select_data_derived`
instead of `aggregation_code`, `modify_data_aggregation` and
`select_data_aggregation`
* convergence now uses parallel chains
* use suffix '-' to specify parameters in monitor that monitor
but not use to calculate convergence - useful for parameters with
bernoulli distribution