Dbconfigadmin

@kalbermattenm : You'll probably kill me for this major revision in one chunk, but could you please review ?
thanks!!!
there is a lot of commented code in admin_functions.py because in a first step I did not yet implement the filtering there
If I'm right, you are creating a global variable here. Are you sure that you want to do that ?

Moreover, it is quite a common name... There is a risk of mixing things up...