Making "passive ftp" default

[Hrvoje Niksic]

With today's prevalence of NAT, I believe that passive FTP should be
made default.

On the systems without NAT, both types should work, and on systems
that use NAT only passive FTP will work.  This makes it the obvious
choice to be the default.  I believe web browsers have been doing the
same for a while now.

What do others think about a switch?  Mauro?