bug#15882: 24.3.50; gnus does not suppress email tracking

[Michael Albinus]

There are many methods to track html emails from remote side. Most of
them do not work when reading emails with gnus, because the shr renderer
does not support javascript or css or suchalike.

However, svg inline with remote images are not detected by shr. You can
test this when sending yourself an email from the webpage
<https://emailprivacytester.com/>, and read that email with gnus.

There shall be an option to suppress such tracking, and this option
shall be set to t by default.



In GNU Emacs 24.3.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.20)
 of 2013-11-12 on detlef
Bzr revision: 115082 monnier@iro.umontreal.ca-20131112191122-1h5gu9yjktzcz6bc
System Description:     Ubuntu 13.10

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  display-time-mode: t
  shell-dirtrack-mode: t
  iswitchb-mode: t
  icomplete-mode: t
  show-paren-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC [ > 1 ; 3 2 0 1 ; 0 c ESC x b u g C-a - ESC O D 
e m a c s TAB DEL ESC O D ESC O D ESC O D ESC O D ESC 
O D - ESC O D r TAB RET

Recent messages:
("/home/albinus/src/emacs/src/emacs")
Loading icomplete...done
Loading /home/albinus/.tramp...done
Loading /home/albinus/src/elpa/packages/debbugs/debbugs-autoloads.el 
(source)...done

Load-path shadows:
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/home/albinus/.emacs.d/elpa/debbugs-0.4/debbugs-autoloads
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/home/albinus/.emacs.d/elpa/debbugs-0.4/debbugs-pkg
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~/src/org-mode/lisp/ox-publish hides /home/albinus/src/emacs/lisp/org/ox-publish
~/src/org-mode/lisp/org-macro hides /home/albinus/src/emacs/lisp/org/org-macro
~/src/org-mode/lisp/ob-maxima hides /home/albinus/src/emacs/lisp/org/ob-maxima
~/src/org-mode/lisp/ox-man hides /home/albinus/src/emacs/lisp/org/ox-man
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~/src/org-mode/lisp/org-feed hides /home/albinus/src/emacs/lisp/org/org-feed
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Features:
(shadow sort mail-extr warnings emacsbug message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mail-utils xterm
cperl-mode debbugs-autoloads info easymenu magit-autoloads
zeitgeist-autoloads package time tramp tramp-compat auth-source eieio
byte-opt bytecomp byte-compile cconv eieio-core gnus-util mm-util
mail-prsvr password-cache tramp-loaddefs cl-macs gv trampver shell
pcomplete comint ansi-color ring format-spec advice help-fns cl
cl-loaddefs cl-lib autorevert filenotify iswitchb jka-compr icomplete
time-date paren ps-print ps-def lpr vc vc-dispatcher dired tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)