bugfix: CEE/json data was lost during disk queue operation
bugfix: memory leak if disk queues were used and json data present
cosmetic bugfix: file name buffer was not freed on disk queue destruction

This was an extremely small one-time per run memleak, so nothing of
concern. However, it bugs under valgrind and similar memory debuggers.
regression fix: %d used for long long types in debug output

regression from recent DA queue bug fix set of patches; not present
in any released code.
Merge branch 'v7-stable'