ggblend
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Affine transformation operations
Also from Paul Murrell's doc it would be nice to implement affine transforms like scale, translate, shear, rotate.
These should also obey the new partition() operation (as blend() does).
Basic versions of this work (except shear). Will need to look into how the justification parameters work on viewports to allow scaling/rotation around a different point than the center of the chart, but this is good enough for a first release.