Caching of ftp connections

Jacob Lerner complained about ftp download not working with Python 1.5.
After some debugging I narrowed it down to urlretrieve() not using a
passive connection.  I'm not 100% sure but it looks like using a passive
connection solved the problem (obtaining the Vim runtime files).

While I was changing the ftp code anyway, I implemented an item from the
todo list: Keep an ftp connection open instead of re-opening it for
every upload and download.  This should speed up ftp transfer of small
files considerably.

However, the network code is complicated, I cannot oversee all the side
effects of using ftplib instead of urllib.  Please try out the new
version.  For now I only checked it into CVS.  A zip archive is
available here:  http://www.a-a-p.org/files/aap-latest.zip

I wonder if the setting for passive mode should be made available to the
recipe writer.  Googling I find a remark that it should be set
automatically depending on the server, but I don't know how.

-- 
   [Another hideous roar.]
BEDEVERE: That's it!
ARTHUR:   What?
BEDEVERE: It's The Legendary Black Beast of Aaaaarrrrrrggghhh!
                 "Monty Python and the Holy Grail" PYTHON (MONTY) PICTURES LTD

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        Sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\              Project leader for A-A-P -- http://www.A-A-P.org        ///
 \\\  Buy at Amazon and help AIDS victims -- http://ICCF.nl/click1.html ///


-------------------------------------------------------
This SF.Net email is sponsored by: IBM Linux Tutorials
Free Linux tutorial presented by Daniel Robbins, President and CEO of
GenToo technologies. Learn everything from fundamentals to system
administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click