This function computes the inverse (or reciprocal) of the generalized logit link function.
     
    inv_logit_gen(petitv)
    Arguments
    
    
    
      | petitv | 
      vector of values to be transformed  | 
    
    
    Value
    ev vector of transformed values
    Author
    Olivier Gimenez <olivier.gimenez@cefe.cnrs.fr>, Roger Pradel, Rémi Choquet