Log Message:
Re-import py-empy from wip as wip/py-EMpy to match upstream package name
and avoid confusion with EmPy/empy.

EMpy (not to be confused with EmPy) is a suite of numerical algorithms widely
used in electromagnetism The package contains:

    * an isotropic and anisotropic transfer matrix algorithm;
    * an isotropic and anisotropic rigorous coupled wave analysis
       (RCWA) algorithm;
    * the numerical model of the frequency response of different well-known
       devices (Mach-Zehnder, Ring Resonators, etc.)