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Hessian procedure

The syntax of this function is:
Hess=INTERVAL_MATRIX IntervalHessian (int l1,int l2,INTERVAL_VECTOR & in)

This procedure should return an interval matrix of
size `m` `n`, `m` in which the Hessian of function
numbered `l1` to `l2` has been updated (function number start
at 1). The Hessian matrix of
function (which is of size `n` `m`) is stored at
location `Hess`((-1)`m`+1`m`,1`m`).
Remember that for each function the Hessian matrix is symmetric: this
fact should be used in order to speed up the evaluation of this
matrix.
If a function in the system is not you set all the elements of
its hessian matrix to the interval [-1e30,1e30]. Remember also here to
verify that each element of the Hessian should be interval-valuable
(see section 2.1.1.3).

Jean-Pierre Merlet
2012-12-20