Merge branch 'bug-16775-live-wire-with-3d-interpolation' into personal/fetzer/miccai-imic-2014.03

Conflicts:
	Modules/Segmentation/Interactions/mitkSegTool2D.cpp
	Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.cpp
	Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.h
Undo/Redo for surface interpolation

Enhanced DiffSliceOperationApplier so that the surface interpolation is updated accordingly
PlaneGeometry is now const for surface interpolation
Button for reinitialization of the 3d interpolation
Contour node is not a helper node any more so that it can be persisted via a mitk scene file
First version for reinit 3d interpolation after application restart.

Added reinit function to surface interpolation controller
Not using the reduced contours for displaying the already delineated contours any more but the original ones.
This is important for the reinitialization of the interpolation since the contours
will be reduced again after a reinit of the interpolation.
Execute reinit interpolation
SurfaceInterpolationController does not use PlaneGeometries for contour detection any more

 * Detection of contours from same slices is now done using coplanarity
 * Adapted test accordingly
 * Fixed execution via GUI
Catching exception during image access
Merge branch 'bug-18041-uncaught-exception-during-surface-interpolation' into personal/fetzer/miccai-imic-2014.03
Removed accidentally added MITK_INFOs
Fixed duplicate interpolation execution
Merge branch 'bug-18042-surface-interpolation-is-executed-twice' into personal/fetzer/miccai-imic-2014.03
Merge branch 'bug-18007-reinitialize-interpolation-after-restart' into personal/fetzer/miccai-imic-2014.03
Added and fixed some documentation
Merge branch 'bug-18007-reinitialize-interpolation-after-restart' into personal/fetzer/miccai-imic-2014.03
Integrated Eigen into superbuild
Using Eigen for solving the equation system for the surface interpolation
Fixed Eigen superbuild and Eigen matrix usage.