Merge from snapshot-2008-09.

code/char.lisp

code/debug-int.lisp

code/env-access.lisp

code/exports.lisp

code/format.lisp

code/internet.lisp

code/loop.lisp

code/numbers.lisp

code/rand-mt19937.lisp

compiler/ppc/arith.lisp

compiler/sparc/arith.lisp

compiler/sparc/array.lisp

compiler/sparc/float.lisp

compiler/srctran.lisp

compiler/x86/arith.lisp

docs/cmu-user/internet.tex

general-info/release-19f.txt