Cleaned json sample files, renamed frame fields, fixed a bug in date
formatting

- only events.clean (coming from HAO test run) has been kept
- commons.js has been updated to take this file as input
- some frame fields have been renamed across files
- units have been fixed
- fixed a bug in date handling: realDate had a bug due to the fact that
the input field was a string. External library (date.format) has been
added to support date formatting
Rewritten filterData to be more generic

- filterData no longer depends on hardcoded field names
Added speed and voltage transformation parameters

- removed volt() function
Changed some field representations to fixed point
Moved date filtering to filterData function
Added some field units
Changed donneesFullScreen according to previous refactorings