[Biopython-dev] run_tests.py rewrite

[Michiel de Hoon]

> In terms of cleaning up the code, something we can probably
> now remove from the print-and-compare handler is the special
> case of modules called via a run_tests method.

I've removed these run_tests function from the print-and-compare tests, and from a few unittest-based tests where this function is not actually being used. I've updated run_tests.py accordingly.

--Michiel.