ange-ftp-get-files is not updating his cache

[Thierry Volpiatto]

Hi,
it seem that `ange-ftp-get-files' always check the content of his cache
in hashtable and doesn't update it after first listing.
Removing the gethash check to `ange-ftp-files-hashtable' fix it.

So I don't understand how this hashtable could be updated when new files
are copied/removed from the ftp server.
IMO this code is wrong.

-- 
  Thierry
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