Really, there should be a way to make configurable by the admin
at runtime (say, a gettmpdir() function).

when no neighboring router is found (rare case).  this is to conform
strictly to the ND spec.  it is safe to leave it empty.

(ok art@)

in sync with kame and bsdi.

this will help future apps from complexity of SIOCGIFCONF.
NOTE: getifaddrs(3) uses sysctl interface, not SIOCGIFCONF.

off_t to be visible in stdio.h even in strict ansi mode.  This is needed
for ftello()/fseeko() and it allows us to remove the horrible fpos_t hack.

Also make fsetpos() and fgetpos() use fseeko() and ftello() respectively
since fpos_t is actually a 64bit type.

is changed, based on discussion in ipngwg scoped address cabal.
past code:	fe80::1@de0
now:		de0%fe80::1
this will be in sync with next extended address format proposal
(which should be final - I don't want to make this kind of change again).

Allows visual editors to be used.

XXX shares database file with IPv4 one (0.0.127.in-addr.arpa)

rcmd(): IPv4 only
rcmd_af(): af independent
ruserok(): af independent
iruserok(): IPv4 only
iruserok_sa(): af independent

Submitted by: kevlo@

calloc(), and realloc().  Idea from NetBSD.

DAD before the actual rtsol(8) run happens later.  and since it will rtsol,
it is going to be up in any case.