Extract the fixed-effect coefficients from fitted objects.
Generic function: see coef.
Extract the estimated fixed-effect coefficients from objects of formal class “glimML”. 
    Presently, these objects are generated by functions betabin and negbin.
Extract the estimated fixed-effect coefficients from objects of formal class “glimQL”. 
    Presently, these objects are generated by functions quasibin and quasipois.