Merge develop to release #701
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The PR replaces vere's current (buggy, insufficient) lockfile mechanism with an advisory `fcntl()` write lock (`F_SETLK`, `F_WRLCK`) on the first byte of vere's PID file (`$pier/.vere.lock`). It does not (yet?) include the functionality to kill the lock-holder and take over the pier, as I'm not sure that's desirable. There have been many problems with vere's current lockfile implementation. The biggest advantage of this approach is that the lock is automatically released if the process is killed or the host system crashes. The biggest question is: does it work reliably across docker shared volumes, virtual machines, &c.
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