python版的计算平面分层介质的GReen函数，可计算时间域和频率域任意场源任意位置任意接收的场值，包括外推积分方法，直接积分方法，介质具有VTI各向异性(The Python version calculates the GReen function of planar layered media, which can calculate any field values randomly received at any position in the time domain and fre