By using the same mechanism as in the shell script:  piping everything through
the 'tee' program.  This may not be the most elegant way from a Python standpoint,
but it seems to work.

Since now my Python testsuite seems to do everything the shell version did,
this commit also removes the shell version.

Having it in bash was starting to be a pain.  This particular testsuite uses
a bit of arithmetic, which was difficult to do in bash, but trivial in Python.