CV Option Menu added sub menus for O2 and CO2 sensors: In the previous implementation by the external sensor menu the problem exists that only three sensor could be displayed. If three o2 sensors were active then the CO2 sensor was not accessible. With the new dynamic view the CO2 sensor is a standalone menu element. The three sensor view was reused from the external sensor menu by introducing a filter (sensor type) functionality. O" and CO2 sensors may now be calibrated using the cv option sub menus.