Make `ftp-make-file-seconds' use a correct year instead of 2002.
Make `ftp-make-file-seconds' use a correct year instead of 2002.

This function was using 2002 when there's no year...  Updated it to use
the last occurrence of the guessed date, as described at
  http://files.stairways.com/other/ftp-list-specs-info.txt

This function still looks pretty bogus -- the RFC does *not* say
anything about the format of response to `LIST', so it's whatever
semi-random thing the server does.  (The above link looks like an
attempt to fix it, but I didn't see anything more official than that.)
From some looking around, it looks like ftp clients just try a bunch of
patterns against the text.  Add also warnings in the documentation about
this.

original commit: 234015b34d43a602dfcabe9365de9027531c2f9f

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket