Prevent some comments being run as doctests
manpage: Update for new demo page logic
Add a benchmark for ingestion
Restore per-item path-segment arenas
Optimize PatchCache::push_line()
Remove a redundant clone
This actually makes a huge difference to ingestion performance.
explorer: Get GTK demo working again
Limit the total number of open FDs
Support restarting an ItemBuilder
Also, move more logic into PatchCache.
Share path segments globally; separate Item and PatchCache
TODO: Add the "too many open files" bug
demo: Use more horizontal space
Don't use accepted MIME types to change behaviour
Special-case "index.html' instead.
demo: Use innerText rather than innerHTML
Handle bad Accept-Encoding headers gracefully
Generalise the header parser to encodings