MIN: Marked several functions as deprecated in the vis module using the new decorator.
MIN: Marked several functions as deprecated in the vis module using the new decorator.

Decorated as deprecated are:

PolarPlot --> replaced by plot_ppi
polar_plot2 --> replaced by plot_ppi
polar_plot --> replaced by plot_ppi
CartesianPlot --> no replacement
cartesian_plot  --> no replacement

polar_plot and cartesian_plot are no longer exposed by the module documentation.

There are other functions in vis for which we should think about the future status.

kmuehlbauer/wradlib,wradlib/wradlib,wradlib/wradlib,heistermann/wradlib,kmuehlbauer/wradlib,heistermann/wradlib