added some default values for the bridgestore variables
not showing the computation graph unless showgraph is passed on the command line
removed the ugly bridgestore hack to see if it is necessary at all
better display of the mappers for input channels
do not display last mappers if there are no mappers
better display of nodes sinks
connected the command-line arguments to the configuration properties (but just for the showgraph argument)
fixed the layers creation when the root of the tree is a selected node