Add test for RAFW from purge-db4o
Test storeTo() for RAFW
Test persistence via storeTo/restoreFrom
Make RandomAccessFileWrapper serializable
Implement serialization for ERAT (make everything transient except type/underlying/etc, and recreate in onResume())
Add RAFW.hashCode() and RAFW.equals()
Test equals() in restore
Add equals() and hashCode() to ERAT and check for equality
Missing file from purge-db4o
Add MasterKeysTest, and fix MasterSecret persistence.
Fix changing password and add unit tests for it
Remove duplicate writing code
Simplify writing code
New format for master.keys, auto-migrate from old format
Implement iteration for nontrivial passwords.
Make sure we don't go over iteration limit
Longer hash