Set PAM_TTY and PAM_XDISPLAY when opening PAM session

diff --cc NEWS
index 85dd777310e1b86770925b3777c3d7c8d99b1969,ca1b99030946678f5ee387c43d6853fdfc23f8b0..c5650b5b8444c2c02704a7782f0d2adf2105c0be
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -1,9 -1,6 +1,10 @@@
  Overview of changes in lightdm 0.9.6
  
 -    *
 +    * Only unlock displays if switched to from greeter
 +    * Make log file not system readable
 +    * Write ~/.Xauthority inside the session process so it cannot be hijacked
++    * Set PAM_TTY and PAM_XDISPLAY when opening PAM session
 +    * Add VNC server support
  
  Overview of changes in lightdm 0.9.5
  

diff --cc src/display.c
Simple merge