Everything except actually *using* BlockchainBDB is wired up, but the db
itself is not yet working. Some error about user mem not large enough.
I think I know what this error means, but I can't determine the cause.
Notes: BerkeleyDB does not allow 0-indexing in its recno type databases,
so block numbers *in the database* will be 1-indexed. Modifications
to indexing have been made as needed.
Some BlockchainDB unit testing fleshed out (and working), rudimentary
linker flag for lmdb in CMakeLists, but should probably be done
"correctly" at some point (find it on whatever system you're building on
and all that jazz).
update for rebase (warptangent 2015-01-04)
fix conflicts with upstream CMakeLists.txt files
tests/CMakeLists.txt (remove edits from original commit)
