||(Though the RapidMiner license is automatically prepended to this file,
the code is actually provided by Robert Harder who placed in the public domain.
Base64.InputStream will read data from another
java.io.InputStream, given in the constructor, and encode/decode
to/from Base64 notation on the fly.
Base64.OutputStream will write data to another
java.io.OutputStream, given in the constructor, and
encode/decode to/from Base64 notation on the fly.