animationCallback = function () {
                                module.verbose('Bar finished animating, removing continuous label updates');
                                clearInterval(module.interval);
                                animating = false;
                                module.set.labels();
                            }
Derive precision for multiple progress with total and values.

This helper dervices a precision that is sufficiently large to show minimum value of multiple progress.

Example1
- total: 1122
- values: [325, 111, 74, 612]
- min ratio: 74/1122 = 0.0659...
- required precision:  100

Example2
- total: 10541
- values: [3235, 1111, 74, 6121]
- min ratio: 74/10541 = 0.0070...
- required precision:   1000

@param min A minimum value within multiple values
@param total A total amount of multiple values
@returns {number} A precision. Could be 1, 10, 100, ... 1e+10.