are_files_available     Check whether the given files exist in the
                        package cache.
ensure_files_available
                        Ensure all given files exist in the file cache,
                        download them if they are not.
erase_file_cache        Delete the full package cache directory for the
                        given package.
get_absolute_path_for_files
                        Construct absolute path for package cache
                        files.
get_cache_dir           Get the absolute path of the package cache.
get_filepath            Retrieve the path to a single file from the
                        package cache.
get_pkg_info            Construct a pkg_info object to be used with all
                        other functions.
list_available          List files that are available locally in the
                        package cache.
remove_cached_files     Delete all the given files from the package
                        cache.
