[gin-data] Update Ftp transfers

[William E. Allcock]

> 4. If these are 3d party transfers, why would a transfer B -> A be 
> different from that of A -> B?

Gregor will have to answer the rest of the questions, but the difference
here, assuming parallelism, is the direction of the connect.  Because of
firewall, or server configurations, you might be allowed to connect in one
direction, but not the other.

Bill