- completed the implementaiton o the 'is dirty' flag to prevent reloading an object being modified. - added a protection against reading an uninitialized field that triggered a PHP 'notice' error.
- completed the implementaiton o the 'is dirty' flag to prevent reloading an object being modified.
- added a protection against reading an uninitialized field that triggered a PHP 'notice' error.

git-svn-id: 8a2b0a969c74f87a9c14cf35f460fb9b394f82c6@201 a333f486-631f-4898-b8df-5754b55c2be0

changi67/itop,changi67/itop,changi67/itop,changi67/itop