Change 1580

Request Review
Changes for 2.4beta.

Yes, Christopher, I brashly said "2.4-dev WAS the beta" at tea
yesterday, but I've since come to my better instincts (got
chicken?), so this one will say

  rmg $ jam -v
  Jam 2.4beta. OS=LINUX. Copyright 1993-2002 Christopher Seiwald.

for a week or two, at least.
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