* guile-test: Wrapped in module (test-suite guile-test).

	* guile-test: Wrapped in module (test-suite guile-test).

	(main data-file-name test-file-name): Exported.

	((guile-user)::main): New function, wrapper for function
	(test-suite guile-test)::main.

	* tests/load.test: Wrapped in module (test-suite test-load).

	* tests/ports.test: Wrapped in module (test-suite test-ports).

	* tests/r4rs.test: Wrapped in module (test-suite test-r4rs).
	Added comments about the required structure of the file itself,
	since it is subject to some tests.  Removed some now unnecessary
	undefine operations.

	* tests/syntax.test: Wrapped in module (test-suite test-syntax)