Do not show charts at the end, close charts after being used #159
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Fixes #154
Also, closes all charts after being used in order to not retain in memory, avoiding the warning message
RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (matplotlib.pyplot.figure) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam figure.max_open_warning).