[MERGE] Review feedback on hash trie inventories, and describe radix tree inventories, plus some details on hash trie implementation.

[Robert Collins]

Thanks Vila, the reward for a review, is another review.

I'd been working on more docs concurrently; getting into the guts of an
updatable canonical form and how that needs to work - the attached has
your tweaks, and new content. I've not down an incremental delta - a
full reread may catch other quirks, and more review is good for this
sort of thing..

Thanks,
Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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