how to round durations to most significant unit ? (5 secs, 889 ms, and 811 μs => 5 secs)

[Timothee Cour]

Is there a function to do this?
If not and I/someone writes it, is there interest to add it to std.datetime?

Duration t = ...;
t.to!string => 5 secs, 889 ms, and 811 μs
t.round.to!string    => 5 secs

t=...;
t.to!string => 889 ms, and 811 μs
t.round.to!string    => 889 secs

Use case: shorter logs.

Similarly, it would be nice to have a module in phobos for representing
other units such as bytes, and have a similar rounding scheme as in unix
command 'ls -lh' which shows 532K, 12M etc)
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