Refactor: Timetag struct without time field

[Stanislav Petrosyan]

At the moment the time field is present in the Timetag structure. Is it really necessary? This field introduces really complicated methods for creating the Timetag.
In my experience I have not needed to access the Time field. Furthermore, no Timetag method uses that value to execute logic.

My proposal is to remove it and keep a single Time() method that returns the timetag transformed into time:

From

type Timetag struct {
	timeTag uint64 // The acutal time tag
	time    time.Time
}

To

type Timetag uint64

[Cesar Gimenes]

I agree with you, it will be much better.