//usage: "[-d] [FILE]"
//usage:#define base64_full_usage "\n\n"
//usage: "Base64 encode or decode FILE to standard output"
-//usage: "\nOptions:"
//usage: "\n -d Decode data"
////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
////usage: "\n -i When decoding, ignore non-alphabet characters"