Merge pull request #37 from MattBBaker/master

Fix eigen spectrum
fix integer overflow in clustering calculations
Merge branch 'master' of github.com:jlothian/INDDGO-survey
applying uncrustify changes
Add option to read largest component apsp matrix; make help more helpful
add -a append option to help output
don't put extra info into .stats file in append mode
Fixed an issue with results appearing to be incorrect.  Specifically,
when we calculate avg degree and edge density, the results for some
graphs were off based o the num_nodes and num_edges in the stats file.
This is because those values are printed before the graph is simplified.
In the case of a graph with duplicate edges, this appeared to make the
avg_degree calculation incorrect.
When running eigen_spectrum with MPI it will now only open and write to the file once.
Merge remote-tracking branch 'eclipse/master'