added mutex locks for imagedataitem method calls with side-effects on the image class
Add tool class for FastMarching.
FastMarching with default values and one seed.
Use multiple seed points
Delete seeds.

Delete seed points with 'del'. CanHandleEvent adapted.
adapt threshold
smaller improvements
visualize seeds
combine segmentation slices
change stopping value with mouse move
fix changing render windows
Documentation.
geometry of segmentation result image corrected.
changed filters to work in 3D.
removed unnecessary steps
Created QmitkSegmentationUtilitiesView
Adapted QmitkSegmentationView.ui to new design
Made changes to SegmentationView in order to make it compile with changed UI file
Changed UI layout of new segmentation button und tool button columns
Added slot for changed tabwidget page