Document the fact that we can detach components of the user interface
@jeff
Submitted by Jeff F.T.
Description
The user manual only mentions that we can detach the viewer, but actually we can do that with almost any part of the UI except the timeline and toolbars; you can "tear off" the various components by dragging out their tab.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=737635
Edited by Alexandru Băluț