Disable the threshold mechanism for now and update examples
See https://its.cern.ch/jira/projects/CMSLITOLSW/issues/CMSLITOLSW-23 for the reasons for disabling the threshold mechanism temporarily.
Other changes:
- Make one of the example threshold files a json file
- Add a README with a short explanation
- Change the names of example algorithms, so that they do not coincide with real algos by accident