Move a portlet relative to its current position UP one row.
@param fragment The fragment to be moved.
@return new coordinate location of the portlet
@throws PortletPlacementException
Move this object up by one in the list of attributes of the container. If this object is already first, do nothing. In this base class, this method throws an IllegalActionException because this base class does not have a setContainer() method, and hence cannot be contained. Any derived object that implements setContainer() should also implement this method.
@return This base class does not return. In derived classes, it shouldreturn the index of the specified object prior to moving it, or -1 if it is not moved.
@exception IllegalActionException Always thrown in this base class.
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