lftp: new package

LFTP is a sophisticated ftp/http client, and a file transfer program
supporting a number of network protocols. Like BASH, it has job
control and uses the readline library for input. It has bookmarks,
a built-in mirror command, and can transfer several files in parallel.
It was designed with reliability in mind.

Signed-off-by: Arnaud Rébillout <rebillout@syscom.ch>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>