`include' handling from Marcus Daniels:

`include' handling from Marcus Daniels:
	* automake.in: New pattern: INCLUDE_PATTERN.
	(read_am_file):  Make AM_FILE a local filehandle.
	For INCLUDE_PATTERN, store included paths on @include_stack and call
	read_am_file with argument.
	(handle_configure): When printing the dependencies for
	Makefile.in, print the items on include_stack (if any) as
	dependencies, too.
	* automake.texi: Make a command index `cm' that goes into the
	concept index.  Put if, endif, else, and include in the command index.
	(Include): Show usage of include directive.