[SciPy-Dev] PR for signal.planck (Planck-taper and Planck-Bessel window functions)

Hi everyone, I'd like to bring to your attention this PR: https://github.com/scipy/scipy/pull/6012 which implements the Plack-taper window (http://arxiv.org/pdf/1003.2939) along with tests and documentation. It's a rarely-used window, with current citations only in the gravitational-wave field of research. I can definitely see why there might be reluctance in merging such a rarely used window. Nevertheless, I'd like to know if there is actual interesting or not, as I could furthermore provide the implementation of the Planck-Bessel and Cosine-Hyperbolic windows as well. Thanks!