SDOPS  Constructor for the set of operating points

     OPS=SDOPS(TYPE,OP_DATA,DECNAMES,options)

     OPS=SDOPS('w',WEIGHTS,DECNAMES)
     OPS=SDOPS('thr',THR,DECNAMES)

 INPUTS
    TYPE      string type of operating point
    WEIGHT    matrix of weights (op.points ws classes)
    THR       vector of thresholds
    DECNAMES  decision names

 OUTPUT
    OPS       SDOPS object