(defined_request_names): New variable.

(defined_request_names): New variable.
(defined_async_names): New variable.
(set_values): New variable.
(tt): New variable.
(tr): New variable.
(rt): New variable.
(rr): New variable.
(at): New variable.
(ar): New variable.
(has_suffix): New function.
(remove_suffix): New function.
(prot_a_type.__init__): Initialize __protover.
(prot_a_type.line_no): Renamed from line().
(prot_a_type.use): New argument: protover.  All callers
	and derived methods updated.
(prot_a_type.protover): New method.
(prot_a_builtin.use_recurse): Ditto.
(prot_a_simple.base_type): New method.
(prot_a_simple.array): New method.
(prot_a_alternate.type_a): New method.
(prot_a_alternate.type_b): New method.
(prot_a_struct.fields): New method.
(prot_a_bitstring.add_field): Store the bits in the order they are
	defined.
(prot_a_bitstring.bits): New method.
(prot_a_selection.fields): New method.
(prot_a_enumeration_of.base_type): New method.
(prot_a_msg): New class.
(prot_a_request): New class.
(prot_a_async): New class.
(menu): New class.
(reader.menu_re): New constant.
(reader.getc_eofok): If a menu line for a request or async message
	is found, store the information.
(reader.menu): New method.
(lexer.section_re): New method.
(lexer.__init__): __implemented_conftypes and
	__implemented_privbits both maps to None, not a random number.
(lexer.run): If __toplevel_at() returns a non-None value, return it.
(lexer.__toplevel_at): Return the result of the called "toplevel_"
	method instead of always returning None.
(lexer.toplevel_set): New method.
(lexer.toplevel_section): New method.
(lexer.toplevel_findex): Store information about the request in a
	prot_a_request instance.  Check the corresponding @section
	heading and @menu item.
(lexer.toplevel_amindex): Ditto for asyncs.
(lexer.__parse_async): New API.
(lexer.toplevel_bye): Generate stable names.  Return the error
	flag instead of calling sys.exit().
(lexer.__parse_request): New API.
(lexer.__parse_type): New argument: protover.
(lexer.__parse_request_arg): Ditto.  Return the parsed info.
(lexer.__bad_arg): Fixed minor typo.
(lexer.generate_stable_names): New method.
(generate_stable_output): New function.