[Changeset] Add the hypot function

[David Bateman]

Matlab maps the libm (or in their case the fdlib implementation of libm)
hypot function into matlab, that calculates sqrt(x.^2+y.^2) but in a way
that avoids overflows for large numbers. This patch adds the hypot
function to matlab and fixes a small issue with the atan2 function when
it is called with sparse matrices.

D.
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