Doctype Classes

We have to discover which implications do apply to our doctype classes and the registry. It would be interesting, if we could get rid of those doctype classes and used doctypes only generically (besides those properties we have to know of due to inner workings such as Names (which relates specially to titles), Sort Keys (which we deal special with in sortings and default to the Name), Short Descriptions (which we want to select per default to be displayed in a table).

In interims solution might be to let new doctypes register themselves. This way we could provide different sets of doctypes that can be bought and deployed independently.

We should get rid of it, if we decide to, in order to have no problems concerning incompatible upgrades ...