Memory monitor validation

Analysing memory monitor files (for each sub-process) in order to report possible memory leak. This is done by doing a linear fit to 'pss' vs 'Time' and reporting its slope to the jobReport. In case of observing an abnormally high slope for a job which is already failed (either with none zero 'rc' or an error in log), a message regarding possible memory leak will be added to the exit message.