* cfg.mk (update-copyright-env): Add, from coreutils.
(VC_LIST_ALWAYS_EXCLUDE_REGEX): Add, for update-copyright exceptions.
* README: Add info about copyright year ranges.
* *: Update copyright notices.
* ping/ping.h (_C_BIT,_C_MASK)
(_PING_SET,_PING_CLR,_PING_TST): Remove in favor of
ping_common.h
* ping/ping6.h: Likewise.
* ping/ping_common.h (_C_BIT,_C_MASK): Moved from ping.h
(_C_IND): New macro.
(_PING_SET,_PING_CLR,_PING_TST): Modified versions of
macros from ping.h.
* ping/libping.c, ping/ping6.c: Update calls to _PING macros.
* ping/ping_impl.h, ping/ping.h, ping/ping_common.h,
ping/ping6.h (ping_stat, PEV_RESPONSE, PEV_DUPLICATE, PEV_NOECHO,
PING_INTERVAL, PING_CKTABSIZE, MAXWAIT, OPT_FLOOD, OPT_INTERVAL,
OPT_NUMERIC, OPT_QUIET, OPT_RROUTE, OPT_VERBOSE, PING_TIMING,
PING_HEADER_LEN, PING_DATALEN): Moved all these common macros and
structures from ping_impl.h , ping6.h and ping_ping.h to ping_common.h.
Removed PING_INTERVAL.
* ping/ping6.c (ping_run): Used PING_SET_INTERVAL similar to
libping.c and used PING_DEFAULT_INTERVAL in place of PING_INTERVAL.
* ping/libping.c (ping_set_datalen): Removed.
* ping/libping.c, ping/ping_common.c (_ping_freebuf, ping_unset_data):
Moved _ping_freebuf, ping_unset_data from libping.c to ping_common.c.
* ping/ping6.c (ping_run): Free memory with call to ping_unset_data.
* ping/ping_common.h, ping/ping.c, ping/ping_address.c,
ping/ping_echo.c, ping/ping_router.c, ping/ping_timestamp.c,
ping/libping.c: Added common headers from ping related
files (ping.c, ping_address.c, ping_echo.c, ping_router.c,
ping_timestamp.c, libping.c) and ping6.c to ping/ping_common.h.
* ping/ping.h, ping/ping6.h, ping/ping_common.h (ping_data,
ping_efp): Moved ping_data, ping_efp from ping.h & ping6.h
to ping_common.h
* ping/libping.c, ping/ping6.c, ping/ping_common.c (_ping_setbuf,
ping_set_data): Moved _ping_setbuf and ping_set_data from libping.c
& ping6.c to ping_common.c
* ping/ping_common.h (ping_address, event, ping_data): Introduced new
unions ping_address and event in ping_common.h. Replaced ping efp
handler(ping_efp/ping_efp6) with event union and socket
address(sockaddr_in sockaddr_in6) with ping_address union.
* ping/ping_common.h (_PING_BUFLEN, _ping_setbuf, ping_set_data): New arg
use_ipv6 and all callers changed.
