add MultiMap
remove old test in Graph
add new module graph_model
Fragment generators move from graph module
change Hash.toString() to toStrHash()
moved test utils to graph package
fix wrong request up/down in FragmentGraphDecorator
and add's test for FragmentManager
fix wrong request up/down in FragmentGraphDecorator
and add's test for FragmentManager
add first realisation of GraphModel
change set argument of GraphModel.setVisibleBranchesNodes to Get boolean function
change around for new API graph, commit, graph_model
fix updateGraph