- estfun, bread, vcovHC
- fix issue in profile.gnm (Matthias Pohlig)
- adapt DrefWeights and getContrasts to accept alternative vcov

BUG in anova.gnm

e.g.

rc1 <- gnm(Freq ~ r + c + Diag(r,c) + MultHomog(r, c), 
           constrain = "MultHomog(r, c)SM",
           family = poisson, data = friend, verbose = FALSE)

anova(rc1)

because constraining one element of 4th term, treats as if all constrained!! (Although shouldn't have to refit full model anyway!)

BUG print.gnm (also print.summary.gnm), e.g. too much space in

Call:
gnm(formula = Freq ~ election * vote + election * class * religion + 
    Mult(Exp(election), religion:vote) + Mult(Exp(election),     class:vote), family = poisson, data = cautres, verbose = FALSE)
