bug#1442: 23.0.60; C-h in allout mode

[Leo]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The following element should be removed from allout-keybindings-list:

 ("^H" allout-hide-current-subtree)

because it prevents "C-c SPC C-h" to list all key bindings starting with
"C-c SPC", unlike other modes.