add reverse-engineered drive notes

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+
+First varint is a header. Lowest bit of header is "endsWithSeq".
+
+When expanding, if "endsWithSeq", is set, add the current index to *every*
+level of the array?
+
+When adding, the current index is always added at every stage of the path.
+
+In the index, include one entry for subdirectories; take the newest element of
+the subdirectory as that entry (which might itself be a deeper nested
+subdirectory entry)
+
+There seem to be extra empty arrays everywhere? not sure what's up with that,
+maybe I have an off-by-one.
+
+The current path counts as an entry (eg, "/README" decomposes to "/" and
+"README", two entries). I'm not sure why... so directories can have entries?
+
+Entry indexes are effectively 1-based (0 is the pubkey entry); don't correct
+for this.