joular/powerjoular

Properly handle multi-threading statistics in Linux

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In Linux, PID CPU stats include child PIDs. However, the specific child stats (through thread TID) are not actualized in real time.
The goal is to explore what are the limits of current PID stats, how to integrate children process monitoring (light process/threads), and how to properly integrate that in PowerJoular.

A first suggestion by @benjaminantunes is proposed in PR #36.