Automatically login the mythtv user at boot

When you boot your machine, it would be nice if it would go straight to MythTV; however, at this point, it boots to the graphical login screen. This is easy to fix; just edit

gksudo gedit /etc/gdm/gdm.conf

change the AutomaticLoginEnable and AutomaticLogin variables to:

AutomaticLoginEnable=true
AutomaticLogin=mythtv