tempo_calc_deviance: Deviance
In vlandau/tempo: Temporally-Explicit Models for Phenological Observations

Calculate deviance for a single MCMC iteration for random effects models

1	tempo_calc_deviance(k, covs, y, params_all, group_ids)

`k`	the MCMC iteration for which to calculate deviance.
`covs`	the covariate data from `tempo_mcmc()` output, `draws`, `attr(draws, "covariates")`
`y`	the original data (same as the y arg to tempo_mcmc())
`params_all`	output from `tempo_calc_all_params_re()`
`group_ids`	is attr(draws, "group_ids"), a vector of group IDs corresponding for the rows in `y`