sam marshall e332d1849d MDL-72643 core: Improve display_size
Allows display_size to use a fixed unit for easy comparison of
multiple results, and fixed decimal places for the same reason.

Improves behaviour by using consistent decimal places and a
consistent space before the unit (the previous one only has a space
before 'bytes', not before 'KB').

Of existing uses, all the ones that displayed a 'maxbytes' type
configuration setting (which are likely to have an 'exact' size
and would be better shown as 512 KB rather than 512.0 KB) have been
changed to use 0 decimal places, to preserve previous behaviour.
All the uses which were showing an actual file or memory size have
been left as default (1 decimal place).
2021-09-27 16:52:33 +01:00
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