* The same mechanism (and the same PostInstallScript) is used for this.
* If a file first_login exists in ~/config/settings/boot, the first-login
scripts are launched, and the file removed.
* This fixes adding the deskbar tray icons even when there is no Deskbar
running yet (for example on first boot when the FirstBootPrompt
starts), or, IOW bug #12275.
* find_directory() and hard-coded paths use /boot/system instead of
/boot/common.
* The build system creates the writable directories in /boot/system
instead of /boot/common.
* The build system no longer installs any packages in /boot/common.