Fix dividing by zero#14
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-nan(ind) is not a way to display zero, it's a result of dividing by zero and this is a crash for int check is only for virtual memory (its amount can be controlled by user) physical memory can't be zero (then how you even run this) not sure about system_cache also optimized math for memory percentages percent_f calculated first, then it converts to int percent
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Lead to issue mentioned in henrypp/memreduct#262 henrypp/memreduct#263
Also slightly optimized math for memory percentages
This is a cumulative PR, includes #13