[BioPython] performance problem in ParserSupport.EventGenerator._get_set_flags

[Andreas Kuntzagk]

> I still don't fully understand this issue, at least I could locate,
> where it fails (to some extend):

Silly, silly me. The tests were using the code from my biopython
installation (whith your patch) and not the cvs version. 
Setting PYTHONPATH and the test works. 
So the patch really breaks somethings. :-(

Andreas