- Added new constant ENCRYPTION_PASSWORDS to application/core/DB_Model.php
- Added new protected properties passwordName and encryptedColumns to core/DB_Model
- Added new private methods _isCryptoEnabledAndValid, _getCipher, _encrypt and _decrypt to core/DB_Model
- core/DB_Model properties insert and update now are making use of _encrypt()
- core/DB_Model properties loadWhere and loadTree now are making use of _decrypt()