[executor] + /proc/start /proc/get

1. DB schema slightly updated to use autoincremental TID
2. test/show_db.py script added to show content of database
3. handlers/queues/none.py queueator created (no queue, only *nix
processes)
4. Error in httphandler.py fixed
5. Several cosmetic changes
6. Well, /proc/start and /proc/get API commands implemented and slightly
tested