History sensitive plots

• made plot functionality capable of appending labels to the flag marker legend, indicating the triggering test.

• added scatter_kwargs keyword to the plot function. (Enabling transparent markers, as well as markers of different size and shape.) I know its not uncontroversial to add ever more keywords - but i added this, since the appearance of the standart plotting+scattering seemed to make a somewhat stiff/clunky impression in the context of the paper to come. With the kwarg key words, in theory, one can produce plots in all pyplots variety, if desired. (also plot methods usually tend to have a lot of keywords)