Made --interface tests less restrictive on host address.

localhost interface.

directly to ftpserver.cmd and removing unneeded empty sections.

the left side of @ to make it short(er).

are not, due mainly to the lack of support for XML character entities
(e.g. & => & ).  This will make it easier to validate test files using
tools like xmllint, as well as edit and view them using XML tools.

transfers. They are done on non-windows systems and translate CRLF to LF.

level stuff. The FTP server communicates with sockfilt using perl's open2().
This enables easier IPv6 support and hopefully FTP-SSL support in the future.
Added four test cases for FTP-ipv6.

when the response come in many small chunks.

it disconnects the TCP connection, like a good ftp client should!

test number.