Standard OFX importer

[doriath]

I am migrating from beancount 2 to beangulp, and I see that there is no standard OFX importer (there is one in the examples but there is not one in the library).

If I implemented it based on the one in the examples and added tests, would such PR be approved (or was there a reason to omit it in the new library)? If it's ok, do you have any preferences for the libraries I should use or what features it should include?

[dnicolodi]

The reason to move the OFX importer to the examples is to do not have to maintain it as a complete and versatile solution. Actually, there has been some talk about dissing the CSV importer too, but it is has too many users for such a drastic measure. OFX is a very loose specification that every banks seem to interpret in a slightly different way and supporting all variations is not something we are looking forward to do.

IMHO being included in beangulp does not offer any advantage to a framework for OFX importers, thus I encourage you to start a separate project for that.