PV 1.1.4

I've finally got around to releasing version 1.1.4 of PV. Elias Pipping and Patrick Collison have been sending patches to improve compilation on Mac OS X, and there are a couple of minor cleanups: left-over IPC resources are cleaned up on termination thanks to Laszlo Ersek, and if you supply a non-numeric argument to an option that needs a number, you now get an error thanks to Boris Lohner.