BDB index keys

["Howard Chu" <hyc@highlandsun.com>]

I've reverted the bdb_modify index behavior to its original state, because it
was getting really ugly trying to make the optimizations work.

It occurs to me that it might help to cache the index keys somewhere in the
entry cache. Not sure if it's really a good idea or not. Any thoughts?

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support