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unexpected error [RT #215]

                        not support the given address family requested.

 391.   [clarity]       ISC_R_FAMILY -> ISC_R_FAMILYMISMATCH.

family than the address specified, return a meaningful error.

on Linux when firewall rules block the send.

                        IPV6_PKTINFO if found. [RT #229]

own CVS tree will help minimize CVS conflicts.  Maybe not.
Blame Graff for getting me to trim all trailing whitespace.

when the debug level does not warrant logging

minor change to make certain 'on' is defined.  This used to be used only by USE_CMSG, but is also used to turn on BSD compatibility, so test on SO_BSDCOMPAT too.

turn on BSD compatibility to avoid the annoying linux 'return host unreachable for unconnected UDP datagrams' bug.

debugging easier.  Also, while here, s/EMPTY/ISC_LIST_EMPTY/g

Mostly, several functions that take pointers as arguments, almost
always char * pointers, had those pointers qualified with "const".
Those that returned pointers to previously const-qualified arguments
had their return values qualified as const.  Some structure members
were qualified as const to retain that attribute from the variables
from which they were assigned.

The macro DE_CONST was added to isc/util.h to deal with a handful of very
special places where something is qualified as const but really needs to have
its const qualifier removed.

Also cleaned up a few places where variable names clashed with reserved
identifiers.  (Which mostly works fine, but strictly speaking is undefined
by the standard.)

Minor other ISC style cleanups.