providing method User#adapt_bv_to_postal_address in order to have the bv match the current postal address.
bv adaption: do not adapt the bv if the user is aktiver.
bv adaption: auto adapt the bv when chaning the postal address.
adding patch to modify the philistration workflow: auto assign the user to the appropriate bv on philistration. Execute the patch using 'rake patch:workflows'.