build a table of them using gen.c.  This means the names are stored twice,
but that will change in the near future.  This will speed up number to text
conversions for rdatatypes, and I plan on speeding up text->number as
well, soon.

	it will need to be freed, dns_rdata_freestruct().
	Changes to implement this.

	Added C++ support to rdatastruct.h

	as opposed to DNSSEC owner name comparisions of names.  Changed
	all rdata types that were using dns_name_compare() to use
	dns_name_rdatacompare().

	Update Copyright dates.

	converted frometext* to use gettoken()
	converted:
		result = foo();
		if (result != DNS_R_SUCCESS)
			return (result);
	to
		RETERR(foo());

	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