* [NOD-863] Write TestCursorNext.
* [NOD-863] Write TestCursorFirst.
* [NOD-863] Fix merge errors.
* [NOD-863] Add TestCursorSeek.
* [NOD-863] Add TestCursorCloseErrors.
* [NOD-863] Add TestCursorCloseFirstAndNext.
* [NOD-863] Add TestDataAccessorPut.
* [NOD-863] Add TestDataAccessorGet.
* [NOD-863] Add TestDataAccessorHas.
* [NOD-863] Add TestDatabaseDelete.
* [NOD-863] Add TestDatabaseAppendToStoreAndRetrieveFromStore.
* [NOD-863] Add TestTransactionAppendToStoreAndRetrieveFromStore.
* [NOD-863] Add TestTransactionDelete.
* [NOD-863] Add TestTransactionHas.
* [NOD-863] Add TestTransactionGet.
* [NOD-863] Add TestTransactionPut.
* [NOD-863] Move cursor tests to the bottom of interface_test.go.
* [NOD-863] Move interface_test.go to a database_test package.
* [NOD-863] Make each test in interface_test.go run for every database driver. Currently, only ffldb.
* [NOD-863] Make each cursor test in interface_test.go run for every database driver. Currently, only ffldb.
* [NOD-863] Split interface_test.go into separate files.
* [NOD-863] Rename interface_test.go to common_test.go.
* [NOD-863] Extract testForAllDatabaseTypes to a separate function.
* [NOD-863] Reorganize how test data gets added to the database.
* [NOD-863] Add explanations about testForAllDatabaseTypes.
* [NOD-863] Add tests that make sure that database changes don't affect previously opened transactions.
* [NOD-863] Extract databasePrepareFunc to a type alias.
* [NOD-863] Fix comments.
* [NOD-863] Add cursor exhaustion test to testCursorFirst.
* [NOD-863] Add cursor Next clause to testCursorSeek.
* [NOD-863] Add additional varification to testDatabasePut.
* [NOD-863] Add an additional verification into to testTransactionGet.
* [NOD-863] Add TestTransactionCommit.
* [NOD-863] Add TestTransactionRollback.
* [NOD-863] Add TestTransactionRollbackUnlessClosed.
* [NOD-863] Remove equals sign from databasePrepareFunc declaration.
