Adding Directionality into MCF

[ntalluri]

No description provided.

[ntalluri]

for graph 3 and 7, I was expected the same edges to be on the output, but that did not happen. *reminder to see why later

[ntalluri]

with the updates to the code, graph 3 and 7 are still not the same. I think at this point, I think the solver may be doing something behind the scenes.

[agitter]

Let's make a v0.1 release before merging this so that this version of MCF can become v0.2. That will make it easier for the Dockerfile in SPRAS to refer to versioned releases of this code.

[ntalluri]

Ready for code review

[agitter]

I finally starting reviewing these changes. I only looked at the code changes so far. I would like to run the updated version locally and inspect all the test graphs before merging.

[ntalluri]

Ready for code review again