Using julia packages.
julia_install_package(pkg_name)julia_installed_package(pkg_name)
julia_install_package_if_needed(pkg_name)
julia_update_package(...)
julia_library(pkg_name)
the julia package name.
you can provide none or one or multiple julia package names here.
julia_installed_package will return the version number of the julia package, "nothing" if the package is not installed.