Make parallelBFS and parallelBFS2 actually callable

Conflicts:
	main.cpp
Start report, document BFS, DFS, TLS
Fix TLS: Initialize AdjacencyArrayGraph.levels
Fix and simplify parallelBFS2, making it as short as parallelBFS
Replace ctime with std::chrono for measuring parallel algos
Fix argument parsing
Ramblings about TLS
Remove commented-out code
measure.py: Adapt to new output format
Merge branch 'master' into i10

Conflicts:
	main.cpp