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binary entry read/write

I've just committed some patches for back-bdb that use my new encode/decode
routines. These use around 1/10th the CPU time of the BER-based encoder. In
a profile of adding 1205 entries to an empty database, slapd calls
ber_memalloc  113172 times. Using the BER encoder it's 412183 times.
Performing 4 searches for all of those entries yields 1357115 memalloc's for
BER-based, and only 275025 for my encoder.

Another aspect of this patch is to cache AttributeDescriptions. Currently my
changes are in back-bdb/id2entry.c but I think it should be done globally
and moved up into slapd itself. I'll look into that some more. Should
probably move the bdb_encode/bdb_decode into slapd too, since back-bdb is
the only thing that uses the slapd entry_encode/entry_decode routines right

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