Reflect Changes in Ground Truth Location

General cleanup + reflecting treating ground truth as just another
algorithm (instead of in a separate directory)
Cleanup cluster_omega_comparison

Several cleanup items:
1) Improve data loading to take advantage of np.loadtext
2) Change number of clusters to be configurable with a default guess of
max(3, sqrt(n)/2)
3) Add ability to print aggregations across datasets
Cleanup run_comparison

Cleanup to treat ground truth as just another algorithm. Also removing
unused code and adding some comments
Incorporating peer review feedback:

-Removing networkx dependency
-Made selecting only least frequent community for a node optional
(instead of having it always happen).
Change Handling of Negative Omega Scores

Change the handling of negative omega scores from taking the abs to
setting it to zero. Use shorthand for transformation.
Improve Readability

Small improvements to the readability of the code