i should mention that before the epg migration i checked in a few allout
changes affecting keybindings.  one enables the user to assign all allout
keybindings, including picking a prefix key sequence and individual key
assignments, as customizations.  another controls whether or not a trailing
control-h on an allout key sequence is conserved for
describe-prefix-bindings, and in keeping with emacs conventions, it defaults
to conserving it.

the latter is another fix that was a due for a long time, and one which i
believe you, leo, were arguing for.

see the allout-keybindings customization group
and allout-preempt-trailing-ctrl-h allout customization variable.

ken