* Modifies a large number of files, but mostly trivially.
* This was to make them compile with C++11.
* (Minor change in macro rules between C99 and C++11 turned out to be very annoying.)
* More usefully, the patch rewrites leveldb-import.cpp to read the message records
* and dump them to standard-out in a JSON-like format.
* (I didn't have a JSON library handy, so I wung it.  But it looks basically right.)