fixed wrong value for plot_columns metadata default parameter; added plot_title_suppress metadata default parameter; in the mdget method, adde the possibility to return an empty string if there is no such metadata parameter; the y-axis limits are adjusted if the outlier removal is on
fixed wrong value for plot_columns metadata default parameter; added plot_title_suppress metadata default parameter; in the mdget method, adde the possibility to return an empty string if there is no such metadata parameter; the y-axis limits are adjusted if the outlier removal is on

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb