v3.3.0

Adds throughput percentile measurement. Average throughput continues to be measured over the entire run, but now sockmeter also measures throughput over regular subintervals (configurable with -tputperiod) and maintains a histogram of these subintervals.

The idea (or one idea) is to use high throughput percentiles to filter for noise from slowstart and random unrelated activity sharing the local system or network. This problem has been partly addressed in other tools with "warmup" periods and by using many connections.

A histogram mode for throughput (-histo tput) is also added.