This was considerable effort, and took a bit more time than I had
hoped.  While newer posts were written with Markdown, previous ones were
writen with my own Markdown-like formatting, but they had enough differences
that it was quite an effort to get things updated.  I also checked the HTML
output of each, though I didn't read every article in detail.

Some of these were more substantial than others; National Uproar, for
example.

These conversions were markup translations: the actual text remains
unchanged, except in one minor instance to add text for the sake of
providing some text to hold a link to a quote.  Any changes to post text
will happen in future commits so that the diffs are clearly visible.