apply conmin function to a SIF problem
[fopt,xopt,gopt]=sifconmin(siffile)
path of the SIF problem file
scalar, criterion at the found optimum
vector, Gradient at the found optimum
vector, optimum location
The sifconmin function decodes, compile, link the given
problem and then call the Scilab function conmin
in order to solve the given
problem.