- isc::data::TypeError is now a subtype of isc::dns::Exception (which i think we should move to namespace isc::)
- isc::data::ParseError not yet; it is a subclass of std::runtime_error (due to the error in quiestion being constructed on the fly, can we add an equivalent of that to isc::[dns::]Exception?
- toWire() family of functions now writes directly to a stream, with a convenience function for Element that does return a std::string
- removed unused and unspecified toXML functions


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/parkinglot@699 e5f2f494-b856-4b98-b285-d166d9295462