* increased spacing around graph
* fixed graph lagging on message focus out
* fixed level assignment fails
* fixed dead ends in cyclic graph removal
* improved node positioning by grouping to same average position
* fixed graph image export not centering graph
* fixed black dot at graph origin
* show status updates while creating trails
* Added TrailLayouter with Sugiyama dependency layouting
* Layouter supports horizontal and vertical layouts
* Added basic ui to graph view for showing incoming and outgoing paths
* Added depth slider, with infinity at maximum
* Disable trail ui when not available
* Added trail messages to undo stack and only use last one when undoing
* Added QtGraphLineBezier for trail graphs and refactored other line types
* Disabled edge activation for trail layouts, shown only visually
* Highlight all connected edges when hovering a node in trail layout
* Use different color when highlighting call edges for better contrast
* Fixed BucketLayouter issue when edge does not leave node
* Increased click area for angled edges
bug id = 249 337
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Eberhard Graether