2.17.7 Stuff:

- New sockets command FLEXI_XNEST_USER and FLEXI_XSERVER_USER.  This is
 used to start login procedure by programs like gnome-screensaver and the
 Fast User Switch applet.  (Matthias Clasen)

- Improvements to PAM logic so that it works more generically with PAM
 modules.  (Ludwig Nussel)

- Better fix for not showing the face browser if the userlist is empty.
 This avoids a needless selection "changed" signal from getting generated.
 (Ludwig Nussel)

- Fix so ConsoleKit logic does not use dbus-glib bindings to using the
 lower level API instead.  Fixes bug #400793.

- Fixes for compiler warnings and for c99 compile issues.  (Ludwig Nussel
 and Jens Granseuer)

- Avoid catching sigchld when trying to call XOpenDisplay.  This corrects
 an issue where GDM catches a second SIGCHLD when trying to restart.
 This causes the slave to freeze even though the Xserver and the session
 are killed, causing the display to no longer manage.
 (Roberto Tam)

- Improvements to PAM documentation in GDM docs.  (Brian Cameron and
 Gary Winiger)

- Translation updates (Djihed Afifi, Theppitak Karoonboonyanan, Priit Laes,
 David Lodge, Duarte Loreto, Daniel Nylander, St\303\251phane Raimbault,
 Hendrik Richter, Alexander Shopov)