Default mesh parameters results in warning

[simon-smart88]

e.g. using the Madagascar malaria dataset, running prepare_data(response, covs, agg, id_var = "ID_2", response_var = "inc", na_action = TRUE) gives:

Warning: Resolution (40,40) too small for convex/concave radius (0.13663516998,6.83175849899999).
Resolution >=(157,203) required for more accurate results.

[simon-smart88]

Unsure if this is related, but the default parameters used to make a mesh with 327 nodes, now it only makes 139.

[simon-smart88]

We are currently using fmesher::fm_nonconvex_hull_inla() but that's been deprecated: https://github.com/inlabru-org/fmesher/blob/60a18e0e466c9aa55c66702c04e283eb89ab17b3/R/nonconvex_hull.R#L739 and it's just returning
fm_nonconvex_hull(resolution = 40), ignoring our default resolution = 300

[simon-smart88]

Switching to fm_nonconvex_hull() resolves the warning: simon-smart88@88c4cbc it's still not generating as many nodes as before though (now 243). I'll submit this next week (CRAN is on holiday)