Add an example 200 event tree used for speed benchmarking.
Update readme with a link to the documentation and lower python version.
Add lambda model probability calculations.
Add tests for lambda model probability calculations.
Update documentation with the lambda model description.
Add a test for a correct lambda probability input.
Closes #11.
Indexation of events. Closes #30.
Remove ProbAnd for string minimal cut sets.
Not needed after indexation of primary events.
Minor refactoring. ~45% MCS Speed Improvement.
Fix the test with ExpandSets.
Merge branch 'develop' into coverity-scan