Cleanup
Reworked layouts.py to find_layouts.py which actually parses sources.
Pretty labels for MSVS.
Added object attribute to nodes.
Revert "Added object attribute to nodes."

This reverts commit cbb89688c1f730da70f0e6b8a90c49e5aa288a41.
ogdf-snapshot-2013-04-29
Merge branch 'develop'

- Updated OGDF
- Build fix for GCC