May be an ange-ftp bug on windows-xp

[Zhang Wei]

The remote server is running Serv-U. We could see "220 Serv-U FTP Server
v6.1 for WinSock ready..." in the greeting message.

If the directory name contain SPACE characters, such as "This is a
directory", ange-ftp can't CD to that dir.

And I find out that the server understand this command:

CD "This is a directory"

but it don't understand

CD This\ is\ a\ directory

But ange-ftp can only compose command as the latter one.

I don't know if this is a emacs bug, or because the server is ill
implemented. But other popular ftp client such as CUTE-FTP don't have
this problem.

------------------------------------------------------------
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In GNU Emacs 23.0.0.1 (i386-mingw-nt5.1.2600)
 of 2006-10-11 on THU-2B8051EF1B3
X server distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.2)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: CHS
  locale-coding-system: cp936
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-agent-mode: t
  gnus-topic-mode: t
  gnus-undo-mode: t
  display-time-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  shell-dirtrack-mode: t
  encoded-kbd-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<mouse-2> <return> <return> <up> <up> <up> <return> 
M-x r e p o r t - e m <tab> <return> e m a c s d <backspace> 
SPC d o n t ' a n <backspace> <backspace> <backspace> 
<backspace> ' t <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> a n g e C-g C-g 
<help-echo> <down-mouse-1> <mouse-1> C-x C-b <up> <up> 
<down> <down> <down> <up> <return> g <up> <return> 
<return> SPC SPC SPC q g C-g l <help-echo> <down-mouse-1> 
<mouse-1> <help-echo> <down-mouse-1> <mouse-1> M-x 
r p <backspace> e p o r t - e m <tab> <return>

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