Fixing slow startup

[Warren Block]

After the update to xfce 4.10, there was about a 30-second delay on 
startup where the desktop background would show, but the panel was 
incomplete and the mouse pointer was still a clock.

This had something to do with the Session and Startup settings.  "Clear 
saved sessions" under the Session tab and disabling "Xfconf Migration 
Script" under the Application Autostart tab fixed it, and now it's back 
to an instant startup.