work on dummy nodes (kollja also does)

doc/chapter/2architecture.tex

@@ -31,6 +31,7 @@ The internal representation of graphs is further explained in the section~\ref{s
     The node can be wider if it contains other nodes that need more space. \\\hline
     height & integer & yes & The minimum height of the node.
     The node can be higher if it contains other nodes that need more space. \\\hline
+    dummy & boolean & yes & Iff this is set to yes, then the node is a dummy node. \\\hline
     layers & list of lists of nodes & yes & The layers of nodes inside this node (Hierarchy). \\\hline
     edges & list of edges & yes & The edges between nodes whose parent node is this node. \\\hline
     \caption{Node Attributes}

doc/chapter/4progress.tex

@@ -10,7 +10,7 @@ The following features are either planned (\planned), under construction (\progr
     \begin{itemize}
         \item[\progress] Calculating the conflicts between edges.
         \begin{itemize}
-            \item[\planned] Differentiating between dummy nodes and non-dummy nodes.
+            \item[\progress] Differentiating between dummy nodes and non-dummy nodes.
         \end{itemize}
         \item[\progress] Calculating the blocks.
         \item[\progress] Compacting the layout.