* commons/graph.ml: bugfix transitive_closure (subtle)
* graph_code/layer_graph_code.ml: comment
* main_codegraph.ml: -class_analysis parameter
* main_codeslicer.ml: get all children of a class, use transitive
closure of inhertance tree, also show stats on biggest "livemakers"
* main_codeslicer.ml: -slice_dir_with_file