[Rd] separators in data()

[Ben Bolker]

  just out of curiosity:

  why is the default behavior in data() for reading in .csv files
to use sep=";" (semicolon rather than comma)?  is this a historical
artifact of some sort, or is there other logic to it?  It caught
me by surprise since I was expecting it to be sep="," as in
read.csv() ...

  cheers
    Ben Bolker

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