Fix lmdb error reporting.
Improve lmdb error reporting.
Upgrade to codec library.
Improve stream error handling.
Remove NOSYNC.
Move factors to LMDB.
Fix histogram test.
Add additional logging before txn.Abort().
Fix factors mapsize.
Bump to alpha version.
Merge branch 'unstable' into multinode
Merge branch 'multinode' of https://github.com/skydb/sky into multinode