Werk #14415: Graphs & dashboard elements: Render byte-related units using consistent SI/IEC prefixes

There are two options for rendering a raw value in bytes as a human-readable number: * SI unit prefixes, where the base factor is 1,000 and the unit prefixes are k, M, G, etc. For example, 1,500 B would be rendered as 1.5 kB. * IEC unit prefixes, where the base factor is 1,024 and the unit prefixes are Ki, Mi, Gi, etc. For example, 1,500 B would be rendered as 1.46 KiB.

Before this werk, Checkmk mixed up these two systems when rendering graphs and dashboard elements by using a base factor of 1,024 in combination with SI unit prefixes. After this werk, Checkmk consistently uses IEC prefixes instead of the mixup mentioned above. Hence, numerical values will remain unchanged, but the displayed units will change from kB, MB, GB, ... to KiB, MiB, GiB, ... .

Furthermore, as a result of this werk, there are now check plugins which report a given value using (consistent) SI unit prefixes but visualize the same value in a graph using IEC unit prefixes. While this is of course not optimal, we prefer this intermediate state over the state before this werk (inconsistent SI unit prefixes with mixed up base factors).

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