1) //! stretch ratio ?(n)
(http://en.wikipedia.org/wiki/Finite_strain_theory#Stretch_ratio)
This comment is wrong, the strectch ratio is |F.x|/|x|, which is a
function of non-diagonal terms. The values returned by getStretchRatio
are not stretchRatios, they have no clear meaning and are not
invariants of F.
As mentionned before, out of diagonal terms have an effect on stretch
ratios (this is why I don't know how to work with _size without Hsize).
One more comment to avoid future misunderstandings : the stretch ratio
is not the strain. For instance a stretch of 0.5 (size divided by 2)
corresponds to a strain log(0.5)=-0.69.
Bruno
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