abs(-2147483648) is undefined, so special-case

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only add NeedsCompilation if requested

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tweaks to ghostscript detection

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Windows now returns long names in SearchPath

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towards eliminating the need for this *.Rout.save

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tweaks for embedFonts

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update/correct comments

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update

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New mirror in Cambridge, UK.

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clarifications

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use shallow duplication (PR#15798)

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doc updates

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updates and tweaks

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MATHLIB_WARNING5() in bgrat()

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skip filter if no CRAN

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add option

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update dates

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Have CRAN incoming check investigate Suggests or Enhances not in mainstream
repositories.

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Use \samp instead of \code for documenting data frame variables with
non-syntactic names.

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report sequence errors

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