sifdecode - decode a SIF problem
Given a SIF (Standard Input Format, see: http://www.numerical.rl.ac.uk/lancelot/sif/sifhtml.html) file
sifdecode(Pathin,Pathout [,opts]) generates associated Fortran routines RANGE.f, EXTER.f, ELFUN.f, GROUP.f and if automatic differentiation is required ELFUND.f, GROUPD.f, EXTERA.f
an associated data file named OUTSDIF.d and an Output messages file OUTMESS are also generated. All these files are created in the directory whose path is given in Pathout
the sifdecode function is based on the Sifdec code (http://hsl.rl.ac.uk/cuter-www/sifdec/doc.html). More precisely it results of an interface of SDLANC Fortran procedure.