Version 0.03
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- merged bauerj's abstracted DB engine contribution to make it easy to
  play with different backends.  In addition to LevelDB this adds
  support for RocksDB and LMDB.  We're interested in your comparitive
  performance experiences.


Version 0.02
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- fix bug where tx counts were incorrectly saved
- large clean-up and refactoring of code, breakout into new files
- several efficiency improvements
- initial implementation of chain reorg handling
- work on RPC and TCP server functionality.  Code committed but not
  functional, so currently disabled
- note that some of the enivronment variables have been renamed,
  see samples/scripts/NOTES for the list