path_package differs from system.file() in that it always returns an
error if the package does not exist. It also returns a different error if
the file within the package does not exist.
path_package(package, ...)Name of the package to in which to search
Additional paths appended to the package path by path().
path_package() also automatically works with packages loaded with devtools
even if the path_package() call comes from a different package.
path_package("base")
path_package("stats")
path_package("base", "INDEX")
path_package("splines", "help", "AnIndex")
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