This change styles the nodes in the QtGraphView. Since Stylesheets can't be applied to QGraphicsItems, the style
implementation was done in the source files. The containers for public/protected/private nodes are now subclassed from
QtGraphNode as QtGraphNodeAccess, including a helper class QtAccessArrow for indicating the opened/colapsed state.
* fitting boxes to name length
* highlighting active edges and nodes
* hover for edges and nodes
* single click selection for edges and nodes
* edges have transparent second line for easier clicking
* sub structure class members by public/protected/private
Graph view has now toggle-able subnodes. Subnodes connected to the active node are always visible.
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* removed const m_dimensions in VectorBase and replaced it with N
* changed signature of DummyNode::operator=
* fixed warning for DummyNode wrongly declared as class
Added simple layouting functions (implementations for simple grid and circle layout).
Also the graph displays class members and connections (edges) to or from them "correctly" now.
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By now the graph displays the active node, without neighbours or anything, and clicking a node sets the active token id to the clicked nodes id.
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Eberhard Graether