I speculate that our increasingly-frequent "no message" crashes are caused by the same thing as the ones that explicitly mention we're out of heap space. We should print the state of the heap every five minutes or so, to get an idea of what's going on.
Add heap heartbeats. Closes #114.
Interestingly, this commit works on my local machine but doesn't generate any logging on the server. Will have to investigate.
I don't really care about this anymore. I'll just take out the heartbeat code, since it never worked anyway.