help.zelig needs some attention

[izahn]

This bug report applies to Zelig Version 4.1-2 on Linux.

The zelig function documentation says "Type ‘help.zelig("models")’
to see a list of currently supported models" but

help.zelig("models")

returns "no vignettes found". This is because the doc/index.html file is empty, but I guess this strategy will not work with the new system of splitting Zelig into ZeligGAM ZeligMixed etc. anyway.

The documentation includes list.zelig.models but

list.zelig.models()

returns 'Error: could not find function "list.zelig.models"' because this function is not exported. The list of models available can be obtained with

Zelig:::list.zelig.models()

so perhaps it will be useful to export this function, or modify help.zelig so that it calls this function instead of

print(do.call("vignette", list(package = "Zelig")))

as is currently done.

[izahn]

As I've been thinking about this I realized I don't understand the purpose of help.zelig. Why rewrite the help function? What is help.zelig actually supposed to do that help() doesn't already do? If the purpose is to document zelig models I think this should be done in the zelig function help page (vignettes can be linked from there).