DHL update

We did a major update of the DHL shipping module in our shop software.
You can now select a DHL parcel station on a nice map
and we are prepared for the next major version of the shop software in a few month.
(We are waiting for a compatible version of a special, German plugin needed to display base prices per 1L/1Kg for bottles of lubricants. A feature required by law.)

Now we will have to wait for the first customer to create orders with the new module, to verify that (bulk) printing and our own extensions are still working as designed. We know that it still does work with orders that already exist.