Api changes between v2.2 and v2.3
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GDALdatasource options. This has always been available as a
RasterSymbolizerproperty and can continue to be set there.
colorize-alphafilter now takes a single color argument (rather than requiring more than one) and will use this single color to paint in place of the existing alpha values.
label-position-toleranceis now a
scalingoption) is not recommended for use and will be removed at Mapnik 3.x