Interactive plots

[mjmroz]

bug fixed

[rpoleski]

Please change version to 0.41.1.

[rpoleski]

1. _mark_second_Y_axis_in_best_plot() and _get_interactive_second_Y_axis_settings_() have some common lines. We try to reduce copy-pasting of the code in order to make future development easier. Please try to define a new function that does the common part of the above two functions.
2. I like the extension. To follow semantic versioning, please increase minor version, i.e., to 0.42.0.

[rpoleski]

Out of my curiosity:

time_grid = int(t_stop-t_start)*7

where 7 comes from? Or why 7 is used here?

[rpoleski]

Thanks!