Refs #8022. Using newer algorithms and methodology.
Refs #8022. Renaming script.
Refs #8022. Renaming individual tests.
Refs #8022. Updating to most recent vanadium file.
Refs #8022. Updating event reference results.
Refs #8022. Adding paths for bigger reference data files.

As requested by Russell, I've added paths where the files can be found so that
the system tests will run on our RHEL6 machine.
Merge remote branch 'origin/feature/8022_snsconverttomdeventstest_revamp'