better leak reporting

Vips::print_all now shows VipsArea leaks as well

ChangeLog

@@ -2,6 +2,7 @@
 - fix some compiler warnings 
 - work around a glib bug that can cause segv under load
 - add some notes on threading to the docs
+- better leak reporting
 
 11/2/15 started 8.0
 - remove old doc stuff, lots of doc improvements

libvips/iofuncs/init.c

@@ -451,8 +451,6 @@ vips_leak( void )
 
 	fprintf( stderr, "%s", vips_buf_all( &buf ) );
 
-	vips__type_leak();
-
 #ifdef DEBUG
 	vips_buffer_dump_all();
 #endif /*DEBUG*/

libvips/iofuncs/object.c

@@ -2949,6 +2949,8 @@ vips_object_print_all( void )
 		vips_object_map( 
 			(VipsSListMap2Fn) vips_object_print_all_cb, &n, NULL );
 	}
+
+	vips__type_leak();
 }
 
 static void *

libvips/iofuncs/type.c

@@ -273,13 +273,14 @@ vips__type_leak( void )
 	if( vips_area_all ) {
 		GSList *p; 
 
-		printf( "VipsArea leaks:\n" ); 
+		fprintf( stderr, "%d VipsArea alive\n", 
+			g_slist_length( vips_area_all ) );
 		for( p = vips_area_all; p; p = p->next ) {
 			VipsArea *area = (VipsArea *) p->data;
 
-			printf( "\t%p count = %d\n", area, area->count );
+			fprintf( stderr, "\t%p count = %d, bytes = %zd\n", 
+				area, area->count, area->length );
 		}
-		printf( "%d in total\n", g_slist_length( vips_area_all ) );
 	}
 }