There's not a lot of point in absorbing the xserver's log file when it
will just be less intuitive for those looking for it in the standard
location. Since the log is generated by Xorg and not sx, it only seems
reasonable.
This commit also renames xauthfile to xauthority for a little more
consistency with documentation and prior art.
Xorg.wrap default system of autodetection of root rights requirement is
wrong in every case I've seen it used. The result is the Xorg server
runs as the root user when it is not necessary.
The main autodetection failure case is when the proprietary nvidia
drivers are used, incorrectly assuming Xorg needs to be run as root.