oomd.conf has two parameters with fractionals: SwapUsedLimit= and DefaultMemoryPressureLimit=, but one accepts permyriads, the other only percentages, for no apparent reason. One carries the "Percent" in the name, the other doesn't. Let's clean this up: always accept permyriads, and drop the suffix, given that it is misleading. I figure we should internally try to focus on scaling everything relative to UINT32_MAX, and if that isn't in the cards at least 10000, but never permille nor percent unless there's a really really good reason for it (e.g. interface defined by someone else).
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