Move Transaction and Split before BankAccount
Move Transaction and Split before BankAccount

Ordering the model classes allows referencing other model via type instead of
strings

lukasjuhrich/pycroft,agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,lukasjuhrich/pycroft,agdsn/pycroft