[Fluxus] git now 0.18

[David Griffiths]

Hi all,

I've incremented the version on git to 0.18 and added a RacketCollects
option to scons. I need this for the ubuntu packaging as the racket
package in launchpad: https://launchpad.net/~plt/+archive/racket
Puts the collects in /usr/share/racket/collects which is a better place
for them debian-wise than /usr/lib but messes up fluxus otherwise.

I've only given self-test a quick run, I'll check the examples now
before getting the packages together.

cheers,

dave