Write a CHECKSUMS file for a directory as on CPAN
* $success = updatedir($dir[, $root])
$dir is a directory. Updatedir() writes a 'CHECKSUMS' file into that
directory, unless a previously written 'CHECKSUMS' file is there that is
still valid. Returns 2 if a new 'CHECKSUMS' file has been written, 1 if a
valid 'CHECKSUMS' file is already there, otherwise dies.
If $root is given, the hash entry with the key 'cpan_path' is relative to
this root directory.
Note: since version 2.0 updatedir on empty directories behaves just the
same. In older versions it silently did nothing.
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