[fluxus] build error: PDataArithmetic.cpp

[Dave Griffiths]

> ...and then it compiles without warnings!  If this is a sane change,
> I can commit it to cvs...

fwiw, It's probably enough for the v0.8 release to have an up to date
xproject file and to get it all building, the problems with the mac binary
we can sort out later. I think the first thing for 0.9 will be a new
interpreter anyway. (well - it will when I've had a bit of a break from
fluxus hacking that is :))

cheers,

dave