cdh - Evaluate Hessian of Lagrangian function
sifdecode(get_sif_path()+'sif/BT1.SIF',TMPDIR+'/BT1') buildprob(TMPDIR+'/BT1') H=cdh(x,v)
Nicholas I.M. Gould - n.gould@rl.ac.uk - RAL
Dominique Orban - orban@ece.northwestern.edu - Northwestern
Philippe L. Toint - Philippe.Toint@fundp.ac.be - FUNDP
see http://hsl.rl.ac.uk/cuter-www