- more work on hull()
 * still not there yet : tried a different implementation (still quickhull) : while some result shows up on the screen ,it is badly broken
 * need to reorganise code for more clarity and other attempts
- quickhull works !! yay ! also:
* moved all the various quickhull implementations to the "extras" module for clarity
* refactored code base on yet another implementation variation: turns out the original try we had was close to the working version
* various small cleanups and import changes (csg.sugar2.coffee) to work with the changes above