fix filename display in "header" and friends

ChangeLog

@@ -9,6 +9,9 @@
 - new vips_sink_memory() keeps read ordering
 - tiff, jpeg, png readers support sequential read
 - max/min avoid NaN
+- oop, histnorm was broken by the new vipsstats
+- never use IM ping to get a header, fixes BMP load
+- set @filename for non-vips formats in vips7 compat layer
 
 20/8/11 started 7.27.0
 - version bump for new dev cycle

TODO

@@ -9,6 +9,8 @@ mosaic
 
 - balance should use new meta stuff
 
+- histogram balance option?
+
 
 resample
 ========

libvips/deprecated/lazy.c

@@ -292,9 +292,17 @@ vips__deprecated_open_read( const char *filename )
 		 */
 		IMAGE *image;
 
-		if( !(image = vips_image_new()) ||
+		image = vips_image_new();
-			vips_image_open_lazy( image, format, filename, TRUE ) )
+		if( vips_image_open_lazy( image, format, filename, TRUE ) ) {
+			g_object_unref( image );
 			return( NULL );
+		}
+
+		/* Yuk. Can't g_object_set() filename since it's after
+		 * construct. Just zap the new filename in.
+		 */
+		VIPS_FREE( image->filename );
+		image->filename = g_strdup( filename );
 
 		return( image );
 	}