rework the INDEX file generation. The new approach speeds up things by

several orders of magnitude and 'make index' now takes 30 minutes or so
instead of several days on my test machine.  The approach now is to take
one pass through every package and extract some key information including
the explicitly listed dependencies.  After the data is extracted, the
dependencies are flattened in one step which avoids the extremely
inefficient recursive make that was previously used.

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