Reimplement contiguous cubies like in M120C

[GoogleCodeExporter]

The contiguous cubies option never worked well and was removed. Try 
reimplementing it using Roice's suggestion in message 1232:


"There is a way to make the implementation of this much easier, which I used in 
M120C.  Instead of shrinking the stickers based on their centers, you shrink 
them from appropriate points on the cell boundary.  You also make it so that 
when the cell size is set to maximum, it fits the cell boundary of the parent 
polytope (which is a very natural choice anyway).  Then you will always have 
contiguous cubies when the cell size is maxed out, regardless of the sticker 
shrink value.  This avoids an awkward dependence of contiguous cubies on both 
the face shrink and sticker shrink parameters (requiring constraint 
calculations to get a working set)."

Original issue reported on code.google.com by [email protected] on 29 Oct 2010 at 4:33