CreateDB constructs a `DB`.

NewFileLock returns a new file based lock manager.

NewProvider constructs a Provider.

RetrieveDataFormatInfo retrieves the DataFormatInfo for the db at the supplied `dbPath`.

Conf configuration for `Provider` `ExpectedFormat` is the expected value of the format key in the internal database.

DataFormatInfo contains the information about the version of the data format.

DB - a wrapper on an actual store.

DBHandle is an handle to a named db.

FileLock encapsulate the DB that holds the file lock.

Iterator extends actual leveldb iterator.

Provider enables to use a single leveldb as multiple logical leveldbs.

UpdateBatch encloses the details of multiple `updates`.