eliminate warnings in freqresp_test.py #543
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…etter-behaved stable transfer function that does not have poles and zeros on the unit circle
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by changing discrete-time transfer function in
freqresp_test.pyto be a better-behaved, stable transfer function that does not have poles and zeros on the unit circle, addressing #538 . This is a somewhat quick fix. It doesn't address the deeper issue of how to best accommodate poles and zeros along the imaginary axis(cont time)/unit circle(discrete time) infreqplot.py.