tive value above. Additionally you can use 'min' and 'max' to test if any of the defined items has a value >= or <= comparative value (default 'or')
	VAR1, VAR2, ... represent the corresponding item's value, VAR is an array of all item values
	If the formula starts with a greater than symbol '>' the value will be treated as threshold. The symbol (text, icon and color) according to highest reached threshold will be shown. The first symbol is the base for values below first threshold, so pass one symbol more 