v1.2.0

• IMP: add_xaxis_twin_as_date is now deprecated and replaced by the more flexible ticklabels_to_datetime and add_twin_axis_as_datetime functions. The tutorials and tests have been updated.
• IMP: make_x_axes_symmetric_zero_centered and make_x_axes_symmetric_zero_centered have now possibility to ensure minimum symmetric axis limits through the min_xlims and min_ylims keywords respectively.