Create an 'avx-controller' script on egg installation.

Note that runController.py can still be run as before.
Update the example init script - the new one requires the
avx-controller script to be on the PATH.
Shuffle things so that the avx-controller script actually works.

I've removed PySide from the list of requirements in setup.py purely
because easy_install can't see the apt-package installation and it takes
an age to download and compile itself. It's also only used in the Client
module which isn't strictly required (I don't think).