mishandling of embedded NULs (was: Re: [Csv] trial zip/tar packages of csv module available)

[Skip Montanaro]

    John> Actually it doesn't quite treat a NUL exactly like a newline; it
    John> throws data away without any warning; see below.

This is to be expected I think, considering C strings are being manipulated
at the low level.  I just added a check to _csv.c and an extra test.  It now
raises csv.Error if the file being read contains NUL bytes.  (Should an
exception be raised on output as well?)

Skip