Align headers and data consistently
This is a bunch of commits, although the overall change is small: I'd squash this down to one, with a suitable explanatory message. The reason I've put in so many separate commits is to illustrate the thought process: alignment of data (in columns) and headers (above the columns) was handled in widely-separated switch() statements. As the bug report says, data and columns should generally have the same alignment. Move all the alignment calculation to one spot and do it consistently.
Note that plugin-headers and their data are still mis-aligned, though. That's outside the scope of this MR.