Get the Dropbox icon to appear in waybar

Install and authenticate dropbox as per Chapter 11, Obtain the encrypted cloud .

Set up whatever is needed for it to show up in the waybar. This produces inconsistent results even reboot to reboot, as well as muttered warnings about deprecated packages. Possibly: the ubuntu packages ayatana-desktop-indicator, libappindicator3-1, and possibly libappindicator3-dev.