system-independent path for source()

Thanks for telling me about file.path. That solves the problem of the
different separators, but UNIX begins the home path with "/" and MacOS
begins the home path with the name of the hard disk.

The opposite problem also occurs when one wants a relative path
    ":some:long:path"
is the Mac equivalent of
     "some/long/path"

Perhaps file.path() should have an absolute/relative path option?

	-thomas

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