In some cases the license-identification header was missing,
so I added that as well. Replaced the remaining headers that
specifically identified "Versions 3.13.7 and higher".
Makefiles and the build system were deliberately excluded.
Modifications to allow for CA multicast listening by adding multicast address
from EPICS_CA_BEACON_ADDR_LIST (or EPICS_CA_ADDR_LIST if beacon list is empty).
Original modifications from Jim Smedinghoff, with further changes by Pierrick Hanlet.