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

	Added C++ support to rdatastruct.h

cvs: ----------------------------------------------------------------------

	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