Set default verbosity to debug for now
Rework janitor exception handling
Make startHandshakeH not leak anymore

Careful refactoring should now avoid leaks (exceptions and handles) of
Server.startHandshakeH.
Fix open Handle leak
Remove debug prints
Add worker watcher

The worker watcher is a small loop that makes sure a worker is
terminated should the handle close.
Handshake with self forbidden
Documentation
Float out int64Size

... which seemed to require surprising amounts of performance during
profiling due to (presumably) having been recalculated on each call