Removed old scenarios. Updated scripts and properties file

- Updated ClassyParams.properties with 2 categories rather than 4
- Minor change to exp-class and exp-results-class scripts. They now
write to logs/histclass
- Deleted active and passive scenarios 7,8,9. This is because there is
now a 'histEnabled' param which can be set instead of calling a
different scenario. To use the old-fashioned active node, simply disable
hist and classification in the hist_active node. Same goes for passive