get_map_old: Try to find the MAP using coordinate descent
In jean997/sherlockAsh: CAUSE: Causal Analysis Using Summary Effect Estimates

v4_li_mat_func and v4_prior_func use working model 4 described here: https://jean997.github.io/sh2Ash/mh_test.html

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get_map_old(pars.start, data, grid, par.bounds, split = rep(NA,
  length(pars.start)), tol = 1e-07, n.iter = Inf, version = 4,
  type = c("null", "causal", "shared"), ...)

`pars.start`	Starting parameters: eg rho, b, q. Should be appropriate for li.mat.func
`data`	data
`grid`	Should be a data.frame with at least two columns, S1 and S2.
`par.bounds`	should be data.frame or matrix number of pars by 2
`split`	Optimization can be split over the range of a parameter if desired.
`version`	Determines likelihood and prior functions The prior on pi is hard coded as dirichlet((10, 1, 1, ...))