[cvs-nhc98] patch applied (nhc98): May need parens when showing negative floating point / double numbers.

[Malcolm Wallace]

Fri Feb 23 08:47:02 PST 2007  Malcolm.Wallace at cs.york.ac.uk
  * May need parens when showing negative floating point / double numbers.

    M ./src/prelude/PreludeText/Show_Double.hs -2 +2
    M ./src/prelude/PreludeText/Show_Float.hs -2 +2