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
if ( imageRef.isResolved( ) )
		{
			EmbeddedImage image = (EmbeddedImage) imageRef.getTargetStructure( );
			DesignElement owner = getElement( );
			while ( owner != null )
			{
				if ( owner.getLocalProperty( module,
						IImageItemModel.IMAGE_NAME_PROP ) == imageRef )
				{
					Module targetModule = null;
					
					
					if ( owner != getElement( ) )
						targetModule = owner.getRoot( );
					
					
					else
					{
						if ( imageRef.getLibraryNamespace( ) != null )
							targetModule = getModule( )
									.getLibraryWithNamespace(
											imageRef.getLibraryNamespace( ) );
						else
							targetModule = getModule( );
					}
					assert targetModule != null;