2.17.1 Stuff:

- No longer crash if at-spi-registryd cannot be started.  
  (Ariel Rios)

- Now support customcommands in GDM configuration so that sysadmins
  can specify custom commands to appear in the GDM GUI (in addition
  to reboot/shutdown/etc.).  Refer to the comments in the GDM
  configuration file and documentation for details.  Also support
  new QUERY_CUSTOM_CMD_LABELS and QUERY_CUSTOM_CMD_NO_RESTART_STATUS
  gdmflexiserver commands.  (Lukasz Zalewski)
  
- Now support for "combo" style lists, and id values of "session"
  and "language" are supported for displaying the session/language
  lists as drop-down combos.  (Brian Cameron).  For example:

  <item type="list" id="language" combo="true">
     <pos  x="25" y="10" height="40" width="300"/>
  </item>
  <item type="list" id="session" combo="true">
    <pos x="50" y="10" height="40" width="300"/>
  </item>

- Now OK/Start Again buttons are sensitive/insensitive in a more
  sensible way for both gdmlogin and gdmgreeter (if GTK style buttons
  are used in gdmgreeter).  (Brian Cameron)

- Face Browser widget and background rectangle (for gdmgreeter)
  is not shown if there are no users to display.  (Brian Cameron)

- Help button now enabled in gdmphotosetup.  (Matthias Clasen)

- Fix so that if timed user script returns an invalid user that
  timed login is not turned on.  (Andrew)

- Fix bug that was causing %t to be expanded improperly when
  used in the timed login label.  (Brian Cameron)

- Set authdir to NULL after freeing to avoid accessing an invalid
  pointer.  Fixes bug #359831.  (Amnon Aaronsohn)

- Introduce altfile[n] property to cater for alternative image file
  definition in gdmgreeter themes.  (Erwann Chenede)

- Leaks fixed.  (Kjartan Maraas)

- Documentation improvements.  (Malcolm Parsons)

- Build improvements.  (Brian Cameron)

- Translation updates (Dwayne Bailey, Luca Ferretti, Satoru SATOH, Jens Seidel,
  Ilkka Tuohela)