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A general description is here.
Many calls to ‘.C()’ have been replaced by ‘.Call()’ to allow long vectors to be supported (now or in the future). Regretably several packages had copied the non-API ‘.C()’ calls and so fail.
Entry point ‘rcont2’ is no longer part of the API, and will move to package ‘stats’ in R 2.16.0.
On OS X, the Quartz versions of the bitmap devices did not respect ‘antialias = "none"’. (PR#15006.)