geierlein 0.9.13 Free Elster client, for sending Germany VAT declarations

Geierlein is a free Elster client, i.e. an application that sends VAT declarations to Germany's fiscal authorities.

Currently it is *not* possible to send returns that are due annually (especially the income tax return) since the fiscal authority doesn't allow doing that off the ERiC library (which is proprietary however). It's not clear at the moment whether one day it will be possible to do so.