[Python-3000] BOM handling

[Jason Orendorff]

For what it's worth:  in .NET, everything defaults to UTF-8, whether
reading or writing.  No BOM is generated when creating a new file.
  http://msdn2.microsoft.com/en-us/library/system.io.file.createtext.aspx

Java defaults to a "default character encoding", which on Windows is
the system's ANSI encoding.
  http://java.sun.com/j2se/1.4.2/docs/api/java/io/OutputStreamWriter.html

Neither correctly reads the other's output.  Pick your poison.

-j