norm(aNumber, low, high)
Normalizes a number from another range into a value between 0 and 1.
Identical to map(value, low, high, 0, 1);
Numbers outside the range are not clamped to 0 and 1, because out-of-range values are often intentional and useful.
Type: function
Parameter(s):
- aNumber {Number}:
The value to be normed.
 - low {Number}:
The lowest value to be expected.
 - high {Number}:
The highest value to be expected.
 
Returns:
- 
    {Number}:
The normalized value.