The ^L implementation was ugly and wrong. Using a character from the already allowed set is better. Also, the motivation for ^L was to avoid breaking existing pages (as much as possible). But using a line consisted of only `-' shouldn't break anything, but only improve the legibility. In the future other characters may be added (like a line of only EN DASH or EM DASH for example.)

use `~username' as tab title if the page doesn't have any headings

Thanks to the fact that we're using a bigger buffer in the net process, and thanks to the way otto@' malloc works, it was easy to detect this off-by-one in a large page (RFC3089 in particular).