from_import             from_import()
install_package         install_package() Function to install a package
                        given a package object
install_packages        install_packages()
is.package_obj          is.package_obj() Returns TRUE if obj is a
                        package_obj object
libraries               libraries()
load_package            load_package() Function to load a package given
                        a package object
package                 package()
packages                packages()
