File system abstraction: if used directly, some file systems did not work correctly with spliced byte buffers (the database engine doesn't use those).

javadoc updates: there is no need to explicitly document thrown exception unless it provides some extra commentary

New feature from Davide Cavestro - allow using custom Java object serialization engines on a per-DB basis.

JaQu: The data type VARCHAR is now (again) used for Strings (no longer TEXT, except when explicitly set).