Documentation links not working

[bpbond]

A number of documentation links don't work, i.e. devtools::check() is reporting errors on them. I'm about to open a PR that changes them (for now) to just \code{}, i.e. removes the links, because I want to make sure the package passes R CMD CHECK for #1 . They include

• \code{\link{mapproj::coord_map}} in diag_header:43
• \code{\link{map.usa}} in gcammaptools:36
• \code{\link{ggalt::coord_proj}} and in Map_Functions:49
• \code{\link{mapproj::coord_map}} in Map_Functions:440

[rplzzz]

That's not too surprising, since map.usa doesn't exist yet. I need to dig up the shapefile for GCAM-USA somewhere. For the others, it appears that you can't link to the documentation for a function in another package (or if you can do it, the way I tried to do it isn't the right way).

[rplzzz]

BTW, I figured out how to link to documentation in other packages. You write \link[package]{function}. When I get a chance I'll go back and fix the broken links identified here.