2d - Cgp in Vigra

A cgp-like graph for 2d segmentations in vigra:
The code does the same as this package, only in 2d.

Here is a short bit of code I wrote to see if my 2d cgp is working.
This is still very unstable code, and some members have strange names, but this
will be fixed soon.
The code is in my fork : https://github.com/DerThorsten/vigra