[MERGE] key-length GraphIndex adapter

[Aaron Bentley]

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Robert Collins wrote:
> I've incorporated John's review feedback on this.

This does not appear to be the correct patch.  It does not provide a
GraphIndexPrefixAdapter.  Instead, it is apparently concerned with
renaming "node" to "key" in various APIs, providing ways of obtaining a
key count, and adding a Dindex flag.

Also, GraphIndexPrefixAdapter is not a very intuitive name.  Perhaps
something relating to "subset" or "filter"?  PrefixFilteredIndexAdapter?

"prefix" to me does not connote subsetting.  A GraphIndexPrefixAdapter
might *add* a uniform prefix to keys, for example.  That might actually
be sensible, if you were trying to make knit/weave repos provide an
interface similar to pack-based repos.

Aaron
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