C.3.9 UUencode and UUdecode functions

 Copyright 1994 by Lance Ellinghouse
 Cathedral City, California Republic, United States of America.
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 Modified by Jack Jansen, CWI, July 1995:
 - Use binascii module to do the actual line-by-line conversion
   between ascii and binary. This results in a 1000-fold speedup. The C
   version is still 5 times faster, though.
 - Arguments more compliant with python standard