Running the daemon 'ontop' should create a pidfile

[VinceGuidry]

Reason is I have scripting to talk to it that needs to know what the pid is, and the only indication of what the pid is happens on the console when it's running, I'd have to manually copy that pid and paste it into the command talking to it. It's important enough to me that I'm investigating how to patch it in and then I'm just going to vendor the code.