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	than isc_mem_t * to provide a general mechanism to pass context to
	the call back.  dns_load_master() has an additional arguement to
	support this.  to get the old behaviour set the arguement, private,
	to the same value as mctx.

	Add master file reader, master.c master.h, incomplete.

	gen.c was not generate correct include file, SWITCHXXX macros were
	being terminated early if last RR type was class specific.

	Added base64 support to rdata.c.

all the code.

  dns_rbt_node_t changed to dns_rbtnode_t to match ISC conventions.

  main() test routine and support functions removed, to be put in
    bin/tests/rbt_test.c

  adding a node and rotating left/right taught to not use parent pointers.

  deletion disabled because it currently does not know how to not use
    parent pointers, and since they are not being maintained by insertion,
    deleting has no prayer of working.

  several isc_result_t returns changed to dns_result_t.

	Initial (committed) implementation of red/black tree of trees.

Makefile.in:
	add redblack.o to libdns.

	txt_fromwire() was not coping with a zero length active buffer.

	totext/fromtext should all work
	towire/fromwire mostly work
	tostruct/fromstruct return DNS_R_NOTIMPLEMENTED
	compare untested