Bug 137917 ImageHandle add setFile method.
According to new Resource Deployment Specification, image builder add a new image type 'File', so ImageHandle should add 'setFile' method as other type methods such as 'setURI'.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ImageHandle.java
{
		String source = DesignChoiceConstants.IMAGE_REF_TYPE_URL;
		try
		{
			module.getActivityStack( ).startTrans( );
			setProperty( ImageItem.SOURCE_PROP, source );
			setProperty( ImageItem.URI_PROP, uri );
		}
		catch ( SemanticException e )
		{
			module.getActivityStack( ).rollback( );
			throw e;
		}
		module.getActivityStack( ).commit( );
	}
	/**
	 * Sets the image scale property. The scale factor for the image given as a
	 * percentage. The default is 100%.
	 * 
	 * @param scale
	 *            the scale value to be set.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setScale( double scale ) throws SemanticException
	{
		setFloatProperty( ImageItem.SCALE_PROP, scale );
	}
	/**
	 * Sets the image size property. The input value is one of the followings