> Done. I added a 'test-pspp-1.sh' test. On this test, the Python implementation is ca. 80x faster than the shell implementation:
$ GNULIB_TOOL_IMPL=py time ./test-pspp-1.sh real 0.43s user 0.33s sys 0.09s $ GNULIB_TOOL_IMPL=sh time ./test-pspp-1.sh real 34.52s user 36.66s sys 6.73s
