Color edges in different colors based on residual their capacity.
Shorten edge labels a little bit.
It suffices to have unidirectional edges from/to source and sink.
Can push flow via augmenting path.
Include flow in dot output.
Fix bfsPath.
Can find max flow now.
Fix adding an edge to augmenting path.

Residual capacity must be used instead of raw capacity when deciding
on maximum additional that can be passed via the path.
Fix capacities for edges going from tag to tag nodes.
Make the limit on the number of slaves on each tag stricter.