ControlSystems.jl
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Add pole zero mapping
From #441, add pole zero mapping for c2d on zpk system. Maybe need to rethink how to handle c2d a bit more general.
There are some related stuff here https://github.com/JuliaControl/ControlSystems.jl/blob/bde0c055a115c433f8204c74f5f8e205dd929c45/src/discrete.jl#L225