Mentat

I have investigated this and the reason is that the name of the PID file is determined before double detach from terminal, so the PID in the name refers to one of the parent process. Problem is with the daemonization library, it is written to be generally usable and knows nothing about the name generation, it expects name to be given. There are following possible solutions:

1. We keep things as they are now. The PID is located inside the PID file, the number in the name is there just for the purpose of uniqueness. This was the original idea, it was never intended to be correct.
2. We change the daemonizer to be more active in generating the PID file name. It will receive just the base name and it will append the correct PID and .pid extension to it. It will however become more opinionated and less testable. Unless there will be some kind of option to enforce the given static PID file name, it will stop being deterministic in tests.

Deployed to mentat-alt for observation.