Advanced pace and percentage vVo2Max datafield

IMPORTANT: this datafield dont fix the 920xt GPS imprecision, so its possible to have spike, it s not a bug. That datafield displays pace and %vVo2Max. The pace is computed in another way from the default pace datafield. The pace displayed is the average speed of the last 3 seconds, and the display is update all 2s. Thus the pace can follow your acceleration with more precision than the default pace datafield. Very useful for short distance training (from 80m to 300m). You have to set your vVo2Max in the setup in km/h, but the datafield convert it into the distance unit you have chosen in the watch.