I just noticed that the following two functions seem inconsistent:
axes.get_xticklabels has a "minor" argument, which defaults to False
However, axes.get_xticklines has no such argument, so in order to get the minor ticklines, one has to go down to the axes.xaxis object. This isn't a huge problem, but the inconsistency seems a little odd. Can we make a minor argument for axes.get_xticklines?