Add an initial keyword-indexer as an alternative front-end to libmandoc.a.

This will be used during BSDCan-2011, paired with a web front-end, as a
demonstrandum of semantic annotations (mdoc) versus those of man.  This
isn't linked to the build in any way but for cleaning created files.  This
code has been heavily tested under valgrind and is known to work on
GNU/Linux (needs -ldb library), all BSDs, and Mac OSX.

Please don't repost this, for the time being, as I don't want to spoil the
fun for the conference.  This utility is still constantly under development
(e.g., it will also generate a recno database of filenames and `Nd' output
so that paths needn't be hard-coded) but is mature enough to warrant being
checked in.

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