Add units for pivot values

[TheMP]

It would be really helpful to add support for displaying proper units in pivot plots - right now the only option is the default k, m, b for thousands, millions and billions. It would be very useful to be able to choose different units, like kilobytes, megabytes or seconds, hours (for dimensions representing duration) etc.

[vogievetsky]

Sounds good!

[linbojin]

👍