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                        [RT #11398]

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

(This is basically bin/named/server.c:base64_cstring_tobuffer(), which I
will remove in another revision that will not need to be pulled up.  I also
would like to change isc_base64_totext() and isc_base64_tobuffer() to be
isc_base64_encoderegion() and isc_base64_decodelexer(), unless there are
exceptions.  I find their existing names to be quite confusing with regard to
what translation function each performs.)

to just 'buffer', as there is no longer a distinction between binary
and text buffers

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.

isc_textregion_t, isc_lex_t

from lib/dns/rdata.c.