Initial Superuser

from README:

at the moment the current version needs users manually created by an admin in the database of the Rdmc. Thus first create a superuser at least, may be also further "normal" users ... then the seal-function works if a user is logged in ... reopen works only if logged in as well ... Redirect to /rdmc/seal after loggin in does not work yet .... some local Django guru is needed here ...

I believe there is no need to have related users with that name in the system but if there are users in the django system there will be a role assigned to the user as well. Also: it is necessary to decide whether an (uploaded object) has the potential to have more than one role (similar to a reversed capability list)