It seemed the wrong pushSource was used due to some automatic
conversion. Also, it complained it couldn't find the file, because a
slash was missing (and nobody noticed before).

And fill it into the rrset.

This was from the template in trac and it is currently not needed.

The tentative interface of the MasterLoader was missing a callback to
add RRsets.

Also, include some small changes to the interface - pass RRClass as
reference and have DEFAULT options value for no special options.

not directly related to this task, but I found we need one real (non wrapper)
example to test some of the feature of generic createRdata().

also updated RDATA template including with-lexer constructor.

an empty qstring previously caused an exception, which is a clear bug
and should be fixed.  nul-terminating string regions is an extension,
but I found it useful when implementing RDATA parsers.

Removed the socket.shutdown() before socket.close() again, this seemed to cause some errors with the statistics tests (which we will look into separately)

Discussed on jabber