* New engine hitex, which outputs its own HINT format, designed especially
for reading technical documents on mobile devices. HINT viewers for GNU/Linux,
Windows, and Android are available separately from TeX Live.
* tangle, weave: support optional third argument to specify output file.
* Knuth’s program twill for making mini-indexes for original WEB programs now
included.
Cross-engine extensions (except in original TeX, Aleph, and hiTeX):
* New primitive \showstream to redirect \show output to a file.
* New primitives \partokenname and \partokencontext allow overriding the name
of the \par token emitted at blank lines, the end of vboxes, etc.
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