Move test data to tests/data.
* test/data/*: Move these...
* tests/data: ...to this directory.
* test/20-pipe-sed-cat.sh, test/20-pipe-sed-cat.stdout,
test/20-pipe-sed.sh, test/20-pipe-sed.stdout, test/41-dot.sh,
test/42-sh-export.sh, test/42-sh.sh, test/50-redirect-in-out.sh,
test/50-redirect-in.sh, test/50-redirect-sed.sh, test/60-subst.sh,
test/100-sed-autoconf-basename.sh, test/100-sed-file.sh,
test/100-sed-fooRbar.sh, test/100-tar-Z-old.sh,
test/100-tar-Z-old.stdout, test/100-tar-Z-pipe.sh,
test/100-tar-Z-pipe.stdout, test/100-tar-Z.sh, test/100-tar-Z.stdout,
test/100-tar-ro.sh, test/100-tar.sh, test/100-tar.stdout,
test/100-tr.sh: Update references.
c5f2f56268