start of work
Imported data.
Prepared the connections graph.
Added the slow algo for actor similarity.
Hero similarity done.
no message
Added Dijkstra.
Lessons finished. Start of work on the exercises.
Updated shortest_dist_node to use heap names dictionary.
updated shortst_dist_node.
Added heaped_names to down_heapiy.
completed heaped alto, added tests
added make_link
works, but some tests fail
Started adding NamedHeap class.
Added __up_heapify__ and NamedHeap test nb.
Added __swap__ to NamedHeap. Started work on __down_heapify__. Added test nb.
Deleted test nb.
completed __down_heapify__.
Added __build_heap__