[Fluxus] commits

[Dave Griffiths]

Some fixes and long awaited items:

* Visible lines control for the scratchpad editor
(set! fluxus-scratchpad-visible-lines 40)
(set! fluxus-scratchpad-visible-columns 60)
... for yer .fluxus.scm.  

* Ctrl-x - same function as F5 (execute) but less fussing about
rebinding keys on the good old Macintosh

* hint-normal now plays nicely with hint-unlit on PolyPrimitives

* Texture caching works for cube maps, and fixed some issues where cube
maps and texture maps were interfering with each other - refactored the
texture code a bit.

cheers,

dave