added support for the new 'max_historic_years' option to the 'nvidia' graph
added support for the new 'max_historic_years' option to the 'phpapc' graph
added support for the new 'max_historic_years' option to the 'port' graph
added support for the new 'max_historic_years' option to the 'proc' graph
added support for the new 'max_historic_years' option to the 'raspberrypi' graph