* check-guile.in: 16 documentation tests were failing if "make

	* check-guile.in: 16 documentation tests were failing if "make
	check" was run before Guile had been installed with the current
	--prefix.  made various changes to the script so that it runs
	without a cd to the test-suite directory.  For the -i option,
	don't point GUILE_LOAD_PATH to the current directory, but let it
	use it's own scheme library.

	* tests/r4rs.test: use test-file-name to locate r4rs.test,
	not data-file-name.

	* guile-test: define tmp-dir, the location where r4rs.test will
	create it's temporary files.
	(data-file-name): use tmp-dir.  this must be under build-dir,
	not src-dir.