Consider moving workstation's paxctld into this repo

[legoktm]

It's in the client repo right now, while the server one is in this repo. Having it in the client repo means it'll be easier to update as we ship new applications instead of requiring new kernel releases (see also #49). But it also means it's not managed with the kernel, and might need changes based on kernel updates??

Mostly filing this to have a spot for discussion, I'd be fine with us deciding to keep things the way they are.