mpf_get_d_2exp ignores sign of input

[Torbjörn Granlund]

paul zimmermann <Paul.Zimmermann at inria.fr> writes:

  I disagree. The fine manual says "D * 2^EXP is the (truncated) OP value",
  which is wrong if say OP = -0.5.
  
  And why bother write 0.5<=abs(D)<1 instead of 0.5<=D<1 if D is always >= 0?
  
Right.  I am testing a fix, and am also rewriting the documentation to
be more readable.
  

-- 
Torbjörn
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