By implementing write_all we lose granularity of progress updates
that are captured from write. Therefore, remove this function. This also brings the ProgressBarIter's Write trait into line with the Read trait since that doesn't provide an implementation of read_all.
By implementing
write_allwe lose granularity of progress updates that are captured fromwrite. Therefore, remove this function. This also brings theProgressBarIter'sWritetrait into line with theReadtrait since that doesn't provide an implementation ofread_all.