Wishlist: RFC 2136 support

[jpmens]

Very nice work, Mark; works like a charm.

Just a gentle reminder, that RFC 2136 support would be very nice to have as well :-)

[goldie80]

This will take some work - the original driver (and this one currently too) opens all the BerkeleyDB tables with flag DB_RDONLY. I'm keen to verify that there's no problems with the read-only support prior to starting down with DNS Update support.