charts: add "'" modifier to Row,Sys,User,Wall columns

This helps reading the precise magnitude of these numbers when large.

I considered also adding more units for the times, but I kinda
like the ability to scan the width of the time columns to see
short vs. long durations without actually reading what they
contain, as a broad-phase scan.  If they were simply HH:MM:SS
it'd require scanning the colon-separated columns with enough
scrutiny to parse zeroes vs. non-zeroes...

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