new file:   lab3aledger/README
	new file:   lab3aledger/queue.scala
	new file:   lab4aledger/README
	renamed:    compile.sh -> lab4aledger/compile.sh
	new file:   lab4aledger/pqueue.scala
	new file:   lab5.tgz
	renamed:    notes/technical_notes.txt -> notes.txt
	deleted:    notes/todo.txt