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

callers use these functions.  Also a lot of TSIG cleanup.

Added dns_message_get/settsigkey to deuglify tsig key handling in message code.

dns_message_pseudosectiontotext to use bitfields instead of flags

in the message structure, even though it should be the root.  Also,
return this name in dns_message_getsig0().

Cleanup of redundant/useless header file inclusion.

ISC style lint, primarily for function declarations and standalone
comments -- ie, those that appear on a line without any code, which
should be written as follows:
   /*
    * This is a comment.
    */

headers and adding it to source files that need it.

                        ISC_LANG_ENDDECLS to header files that had function
                        prototypes, and removed it from those that did not.

                        to conform to the same style for multiple inclusion
                        protection.

                        Added:
                                isc_buffer_base(b)          (pointer)
                                isc_buffer_current(b)       (pointer)
                                isc_buffer_active(b)        (pointer)
                                isc_buffer_used(b)          (pointer)
                                isc_buffer_length(b)            (int)
                                isc_buffer_usedlength(b)        (int)
                                isc_buffer_consumedlength(b)    (int)
                                isc_buffer_remaininglength(b)   (int)
                                isc_buffer_activelength(b)      (int)
                                isc_buffer_availablelength(b)   (int)
                        Removed:
                                ISC_BUFFER_USEDCOUNT(b)
                                ISC_BUFFER_AVAILABLECOUNT(b)
                                isc_buffer_type(b)
                        Changed names:
                                isc_buffer_used(b, r) ->
                                        isc_buffer_usedregion(b, r)
                                isc_buffer_available(b, r) ->
                                        isc_buffer_available_region(b, r)
                                isc_buffer_consumed(b, r) ->
                                        isc_buffer_consumedregion(b, r)
                                isc_buffer_active(b, r) ->
                                        isc_buffer_activeregion(b, r)
                                isc_buffer_remaining(b, r) ->
                                        isc_buffer_remainingregion(b, r)

                        Buffer types were removed, so the ISC_BUFFERTYPE_*
                        macros are no more, and the type argument to
                        isc_buffer_init and isc_buffer_allocate were removed.
                        isc_buffer_putstr is now void (instead of isc_result_t)
                        and requires that the caller ensure that there
                        is enough available buffer space for the string.

- SIG(0)'s can be rendered, and information is stored to allow them to be
verified after parsing.  This needs some cleanup work done.

same thing for rdata, rdatalist, and rdatasets.

Also implement dns_message_takebuffer().

See comments in message.h for news.