bug#15809: 24.3.50; wrong defcustom type for `suggest-key-bindings'

[Mattias Engdegård]

[ Resent to debugs only, because my previous attempt was eaten by a grue.
  Sorry if you get this twice or not at all.
  A modern Emacs bug tracker cannot arrive soon enough! ]

> (define-widget 'natnum 'restricted-sexp
>  "A nonnegative integer."
>  :tag "Integer (positive)"

Sorry, but this is just wrong. 0 is not a positive integer. If nobody fixes 
this then I will.

And regarding whether natural numbers include zero, the answer is that yes, 
they do. The notion that they don't is antiquated; today 0 is assumed to be 
included by default unless otherwise stated or hinted in the notation. Let's 
not spread some silly 19th century bickering about something that was settled 
long ago.