Including Ofx160.dtd as native option on SgmlReader

[olavorn]

This enables SgmlReader to use option "ofx" in a native way.

[lovettchris]

This is not really necessary, the user can always include the OFX.dtd in their own app. The only reason I included HTML in SgmlReader is because it is such a common use case.

[olavorn]

I Agree @lovettchris ,

Anyway I think bringing this inside is a much more straightfoward way for those who are looking for an Ofx Reader (my case). :)

And in an architectural point of view, I expect the cases that this .dtd is shared with the rest of the application will be far from usual.