neu: kategorie, config + test

__init__.py

@@ -8,10 +8,15 @@ from .book import Book
 from .types import Type
 from .line import Line, LineContext
 from .wizard_openline import OpenCashBook, OpenCashBookStart
+from .configuration import Configuration, UserConfiguration
+from .category import Category
 
 def register():
     Pool.register(
+        Configuration,
+        UserConfiguration,
         Type,
+        Category,
         Book,
         LineContext,
         Line,