> Certain types like GIConv and GdkAtom are pointers internally but don't
> look like pointers when referenced. They have the form.
>
>  typedef struct _X *X;
>
> Parse these as structures/records but mark them in the gir with a 'disguised'
> attribute so that we know that they need special handling.

Additionally, stop relaying on disguised attribute when deciding whether
to render a page. Check number of fields instead, so as to avoid
introducing large regression in the docs.

Fixes #101.