Weird parameters to q-transform crashes python interpreter

Created by: areeda

I was trying to write a test case for the new Q transform in gwpy-plot. I think there is only one second of test data available so I tried to use that. I doubt this is a real use case but the fact that it crashes the Python interpreter with segmentation qtest.zip

fault suggests we should look into it.

Attached is a test program that demonstrates the problem with Python 27 on my Mac. It doesn't crash on a head node but it does hang consuming a lot of CPU and memory.