Fix export

[gdolle]

This PR should solve issue #176

[cbrnr]

Can you give an example where the current implementation gives an error? ffilter has a default value of "*", so I don't know what the problem is.

[gdolle]

try to export file->export (all functions does not have a ffilter arg)

[cbrnr]

Ah OK! Hmm, when did I break this? It seems like the export mechanism is overly complicated, I have to figure out what all this extension and ffilter stuff does and if it is really necessary.

[gdolle]

I agree it could be cleaner. (I suggest just a workaround for the bug) ;)

[cbrnr]

Yes, at some point the exporting functionality should be refactored, but for now we need a workaround. Would it be simpler to just add the ffilter parameter to the functions in model.py that only have an fname parameter?

[gdolle]

I'm not sure it is better in terms of design.
If more arguments are required later, that mean you have to change the prototype for all your export functions (with unused args)

[cbrnr]

I've created #178 to discuss this.

[cbrnr]

Thanks @gdolle!