dataframes in glm (PR#392)

[jlindsey@alpha.luc.ac.be]

According to the glm documentation, an optional dataframe can be
supplied in data=. It would be nice if any object that can be coerced
to a dataframe (as.data.frame) were accepted. I am thinking of my data
objects. As it stands, I have to use data=as.data.frame(object) in
glm.
  As far as I can see, the only change required is to add a line in
models.R. After l.216:

if(missing(data))
	data <- sys.frame(sys.parent())

add

else if(!is.data.frame(data)&&!is.environment(data))
	data <- as.data.frame(data)

I don't think this should have adverse effects elsewhere and would
make life easier for the users of my libraries.
  Thanks. Jim

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