Creation of R dependency list does not reorder for indirect dependencies

[mlell]

Currently, R packages extracted from their code are reordered so that each package is installed after its direct dependencies.

tapas/scripts/gen/scan_r_dependencies.R

Lines 10 to 11 in 6d7e273

	deps <- tools::package_dependencies(p, recursive = TRUE)
	deps <- lapply(deps, rev) # Dependencies must come before top-level pkgs

But this doesn't resolve all problems, currently some packages must be reordered manually.