Define a new attribute in the datasource 'internal_uid' used for both generating eduPersonTargetedId and user consent. Otherwise we're in trouble if 'uid' is not defined for a given account profile


git-svn-id: https://svn.geant.net/GEANT/edugain_testidp_account_manager/trunk@114 047e039d-479c-447e-8a29-aa6bf4a09bab