[Fluxus] commits

[gabor papp]

> * frisbee works again on recent versions of plt scheme
> * primitive types are checked before attempting to save them with
> different file formats
great, thanks.

i also made some small commits recently.
* load dialog refresh - if you saved your script and tried to load it, 
it didn't show up in the load dialog earlier
* voxels accept colour types instead of vectors
* voxels->poly, the intermediate voxels->blobby step is no longer necessary

best,
gabor