[Fluxus] xfade

[gabor papp]

hi Kassen,

congratulations. if you are worried that you might break something i 
suggest that you make your own branch in git and experiment there. we 
can merge your branch into master later and/or cherry-pick your commits.

> doing this I can't really give any warranties on that though :-). I created
> a help entry in fluxa.ss, but so far can't get the fluxus help function to
> recognize that.
you need to run docs/makehelpmap.scm before 'scons install' to generate 
a new helmap.

best,
gabor