Nyquist plot improvements by murrayrm · Pull Request #534 · python-control/python-control
* regularize argument parsing by using _parse_freqplot_args * fix bug in exception handling (ControlArgument not defined) * change printed warning to use warnings.warn * add unit tests for exceptions, warnings
* start tracing from omega = 0 * add support for indenting around imaginary poles * change return value to number of encirclements (+ contour, if desired) * update MATLAB interface to retain legacy format * new unit tests
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