Function bed_reader::sample_files

pub fn sample_files<I, P>(path_list: I) -> Result<Vec<PathBuf>, BedErrorPlus> where
    I: IntoIterator<Item = P>,
    P: AsRef<Path>, 

Returns the local paths to a list of files. If necessary, the files will be downloaded.

SHA256 hashes are used to verify that the files are correct. The files will be in a directory determined by environment variable BED_READER_DATA_DIR. If that environment variable is not set, a cache folder, appropriate to the OS, will be used.