Stabilizing 2.4.0

[Bill Nottingham]

Derek Atkins (warlord at MIT.EDU) said: 
> > - QSF export (or was this active in 2.2.9 already?)
> 
> This should be off unless the crashing issues have been fixed.  And even
> if those issues HAVE been fixed we might want to disable it because we
> have no QSF import.

Exporting of account tree to QSF was enabled in 2.2.9, but crashes
due to a GTK bug. 2.3.x doesn't hit the GTK bug, so it doesn't crash.

Bill