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
* Do not write ~/.dmrc and ~/.Xauthority as root. [CVE-2011-3349]