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General updates
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- add support for Python 3.8
- make ``libgsl`` dependency optional
:mod:`nd.classify`
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- removed redundant method :func:`nd.classify.cluster()`, as same
functionality can be achieved using :class:`nd.classify.Classifier`
:mod:`nd.tiling`
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- added :func:`nd.tiling.debuffer()` to automatically remove buffer from
tiled datasets
:mod:`nd.utils`
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- added :func:`nd.utils.apply()` to apply functions with specified signature to arbitrary subsets of dataset dimensions
:mod:`nd.visualize`
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- added :func:`nd.visualize.plot_map()` to plot the geometry of a dataset
on a map
- added :func:`nd.visualize.gridlines_with_labels()` to add perfectly aligned
tick labels around a map with gridlines