Consistency Report

[bbengfort]

Add a consistency checking module that looks at a log and determines how consistent it is along the same lines as the tests:

Single log:

1. Check # of forks in the log
2. Check if versions are monotonically increasing inside of the log
3. Check for any duplicate entries in the log
4. Check for # of missing entries

Multi-Log

1. Jaccard Similarity of Logs
2. Edit Distance of Logs

Put all of these metrics into a report that goes into the results.