This obsoletes the remaining libconfig patches starting at
id:1463135893-7471-6-git-send-email-david@tethera.net
I've addressed (my own) comments there. In
[Patch v6 2/7] lib: config list iterators
I decided to use "placement new" to allocated a Xapian::TermIterator,
rather than a pointer. This is slightly more exotic C++, but it
reduces number of dereferences in the code.
I think this series has got all the feedback it's going to, so I'm
going to go ahead and mark it ready to merge.