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DB_THREAD and Concurrent DB support

I made changes which effectively serialize access to the
BerkeleyDB API as more work is needed.

If someone has time, they could:

If HAVE_BERKELEY_DB_THREAD, use a giant reader/writer
lock instead of giant mutex.

If HAVE_BERKELEY_CDB, use Concurrent DB provided
synchronization, e.g. no giant mutex (or r/w lock).

Please coordinate on this list to avoid duplicate effort.
Please adhere to devel/contribution guidelines, etc.