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* Fix pip installation, clean up setup procedure, flake8 and add README (3)
* PiecewisePolynomial1DFit updated to work with scipy 0.18.0 (4)
* Delaunay2DScatterFit now based on scipy.interpolate.griddata, which is
orders of magnitude faster, more robust and smoother. Its default
interpolation changed from 'nn' (natural neighbours - no longer available)
to 'cubic'. (5)
* Delaunay2DGridFit removed as there is no equivalent anymore (5)