Elliott Sales de Andrade

Sorry there hasn't been much discussion here. I've put this on [the agenda for tomorrow's meeting](https://hackmd.io/l9vkn_T4RSmk147H_ZPPBA).

Sorry I meant to comment last week after the meeting, but it seemed to have been left here without going through. In general, we are in favour of this change....

Are you sure you are using the Qt5Agg backend? That one has the toolbar on the top of the figure and has separators between button groups.

I think that problem was fixed by #156; can you update this PR?

This is failing with current versions of Pandas: ```pytb _____________________ ERROR at setup of test_synthesis_df ______________________ request = module_results_df = pytest_obj ... accuracy test_id s...05 score ... NaN [12 rows...