Format ~$ buglet

[Scott L. Burson]

In 1.3.2,

  > (format nil "~$" -32.17)
  --32.17

Negative values are getting a double minus sign.

The right fix seems to be, in 'format-dollars', to pass '(abs number)'
rather than 'number' to 'sys::flonum-to-string'.

-- Scott
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