Timestamp accuracy

[jeinstei]

I was having issues with the timestamp field losing accuracy when being calculated in a single line. I haven't looked much more in to it, but I needed to patch with the code below to get the accuracy back after calculation. I'm working with nanosecond resolution timestamp captures.

    @property
    def timestamp(self):
        # First, get the accuracy from the ts_resol option
        high_scaled = (self.timestamp_high << 32) * self.timestamp_resolution
        low_scaled  = (self.timestamp_low) * self.timestamp_resolution
        scaled = high_scaled + low_scaled
        return scaled