api-sort: be more robust.
api-sort: be more robust.

	* doc/bin/api-sort: Sort all the symbols first.
	Provide more debug features.
	Don't issue useless ZZZZZ entries.

urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi