Impact report - changes in algorithm, performance 10x improvements, and various fixes

* New algorithm for subset of relations taken.
* Visual improvements for viewing impact
* Performance optimization
* Completly removed old tree-chart view

http://ralph.allegrogroup.com/buildbot/builders/unittest-ralph-vi4m/builds/138
http://ralph-ci.office/buildbot/builders/unittest-ralph-vi4m/builds/138