Write up rough to_graph function. I have no clue if it works nor not.
Hacking about
~2000 gates short when converting the SHA1 circuit to graph.
Update sha1 builder test.
320 as min-cut size is not correct...
Source/sink nodes in graph connected with 1-capacity edges instead of infinite, correct answer of 160 as min-cut for SHA-1!
Move graph stuff to sha1 package, change test to a standard script for min cut.
Merge circuit graph branch.