Display bandwidth in different unit families (#328)

* Allow selecting unit families

- Supported units are {binary,SI}-{bytes,bits}

* Fix typo

* Better error msg in the unreachable case

* - I can't believe I did this. Frankly, terrible.

* Add unit test

* Add peta&pebi units to be absolutely future-proof

* Minor code style improvement

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 816e39d..5ae051c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -187,6 +187,7 @@ dependencies = [
  "resolv-conf",
  "rstest",
  "simplelog",
+ "strum",
  "sysinfo",
  "thiserror",
  "tokio",