Add differential memory graph option
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A recent addition to CAFCore is that we can request a graph showing the evolution of memory usage of the analysis (i.e. the executed process) not just in absolute terms but for each recorded point as the difference to the previous one. This can be a great help identifying memory leaks and/or steps which consume large amounts of memory.
-> add a few lines to analyze that can create the pdf of this graph
Link items together to show that they're related or that one is blocking others.