Adapt power_cpufreq layout and set CurrentCoreWatts

[PATCH 3/5] Adapt the power_cpufreq layout and set the
 CurrentCoreWatts value based on the selection of the
 resources and the choice of CPU Frequency.
 CurrentCoreWatts are set to IdleWatts when one or more
 jobs occupy other resources of the node and set to 0
 when the node is free. The above algorithm is activated
 only when powercapping is active.