Adjust the copyright declaration in this (RSE's) copy of the OpenPKG source code now that the fork point for C&W was established (CVS tag OPENPKG_CW_FP), the shared copyright agreement between RSE and C&W is no longer active (as C&W no longer officially sponsors OpenPKG) and the new shared copyright from RSE can be taken over by the newly established juristic entity OpenPKG Foundation e.V. (instead of the non-juristic entity OpenPKG Project).