memory_percent plot to show the memory usage during sweep
memory_percent plot to show the memory usage during sweep, depends on the newest version of icsystemutils, so needs to update ictasks dependency etc
Also slightly cleaned up the monitor plot code in reporter.py and allows a core_argument argument to be passed to icflow monitor_plot, which will plot to a task argument from the sweep, i.e., can pass it num_cores and will use that value for each task to plot the number of cores instead of number of tasks.