Tkui's keybindings shouldn't generate history

In my opinion, pressing function keys, keypad keys, etc., shouldn't
generate history. It is particularly annoying when you have navigation
bound to the keypad. When you then browse through the history you will
then mostly find n, nw, etc., instead of things you've actually typed.

It's trivial to change:  in callBinding and _executeBinding we can
call exported.lyntin_command with internal=1 instead of handleinput as
it is now. This also disables the from_user_hook -- I don't know if
that might have some consequences.

Anyway, I find it much more pleasant.

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