Add InvertibleMap & first realisation & tests
NodeRow.getVisibleNodes -> getNodes
added blank for newGraph
write code for EdgeController & ElementVisibilityController
finished graph class
change class Branch & fix test
fix Branch equals & hashCode
fix ElementVisibilityController.isVisible()
fix conception in MutableGraph
add GraphBuilder for NewGraph
add GraphAdapter(NewGraph -> Graph) & test for NewGraph
return to concept with upEdges & downEdges saved in Node
add usage OneElementList in MutableCommit
fix bad integer index in MutableGraph
returned to Graph.getNodeRows()
fix depend of Branches in Graph
GraphBuilder returned MutableGraph
add branch show/hide capability
Branch.getUp/DownNode & several changes in testUtils
new GraphFragment & test for FragmentGenerator