Multiplication of unbalanced operands

[Torbjorn Granlund]

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The diagrams in the paper shows the scary state of unbalanced
multiplication in GMP 4.2.  We knew it was not optimally handled, but I
suppose no-one knew just how bad it was.  (Note in particular N = 10000
and N = 20000, how we switch into FFT and gain much time!)

Note that the diagrams' N = XXXX means that the product is XXXX limbs.
The X axis is the size of V, i.e. vn.

-- 
Torbj?rn