rtss - Relative TimeStamps for Stuff.
io::Write implementation which prefixes each line with a timestamp since
a start time, and the duration since the previous line, if any.
Also a couple of utility functions for formatting
Duration, and copying from
one IO to another.
A writer that prefixes all lines with relative timestamps.
Copy each line from
output, prepending the output line with
elapsed time since
start and since the previous line, separated by
until EOF or IO error.