Changes 0.1.8:
* New operations: spread, vignette, map-relative, noise-reduction, plasma,
    fractal-trace, exr-save, lens-correct, emboss, cubism, ripple,
    color-to-alpha, color-rotate, red-eye-removal, convolution-matrix,
    deinterlace, polar-coordinates, lens-distortion, pixelise.
* Split GeglView GTK Widget into separate utility library
* build/test improvements.
* Buffer:
* Added lohalo resampler, API and infrastructure for doing non affine
  resamplings.

(adam)