pySTEPS/pysteps: pysteps 1.0.0

Changelog for version 1.0.0: Change pysteps license to the less restrictive BSD-3 Move documentation to Read the Docs (https://pysteps.readthedocs.io/) Include a gallery of examples Modify setup.py to explicitly link libraries in macOS Include Travis CI and Codecov Add test suites for interfaces, and the io and verification modules Remove legacy config module Add CONTRIBUTING.rst Several docstring improvements Add exporter for KINEROS2 Rainfall files Add importer for MeteoSwiss AZC radar composites Add importer for KNMI HDF5 radar composites Add scripts for estimating velocity perturbator parameters Add modules for deriving the auto-correlation function (ACF) and estimating precipitation lifetime Implement a separate module nowcasts.sprog for S-PROG nowcasts Add nowcasting module nowcasts.sseps, an experimental version of STEPS that allows for localization Implement interfaces for initializing and calling different FFT methods Rework of the extrapolation interface Faster implementation of the rank histogram with bug fixes Improve subplot handling in plot_precip_field Add visualization of Fourier spectra Rework interfaces for verification scores Add support for MaskedArray in motion.dense_lucaskanade Improve masking in nowcasts.steps modul