DBServer: Clean extra tab-level from FSDB.
DBServer: Fix typo in delete_object log in FSDB.
DBServer: Change IDatabaseEngine to more cleanly handle id_ranges.
DBServer: Use more descriptive variable name in Server constructor.
DBServer: Remove unused import in DatabaseServer.cpp
DBServer: Improve in-code comments for DatabaseServer.cpp
DBServer: Update DBEngineFactory to pass min and max ID on creation.
DBServer: Use cleaner database API, with consistent variables names to IDatabaseEngine.
DBServer: Cleanup FSDB code.
DBServer: Fix time-based issue with FSDB unittest.
Merge pull request #62 from OpenOTP/kestred

Cleanup database code