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(This is a remake of #200 but getting rid of those 2 extra commits that sneaked into it by accident)
2 patches changes in this pull request:
a) states.PerfdataMetric.split_value_and_uom() moved to be a module level function instead of a method of PerfdataMetric
b) new function get_base_value() designed for common arithmetic like convert gigabytes into bytes.